Abstract:
An aiming device for a projectile launcher, such as an archery bow, has 2 concentric light bending devices. A rotation mechanism allows the light bending devices to be rotated in opposite directions relative to one another in a synchronic manner that carries a line of sight through the aiming device to move along a substantially straight vertical line as the rotation mechanism is rotated. The rotation mechanism is calibrated to show how much rotation causes the line of sight to pass through where a projectile launched from the projectile launcher would be when it reaches a particular distance from the projectile launcher.

Description:
BACKGROUND  
       [0001]     The subject invention relates to the aiming of projectiles that are launched at a visible target object from bows, crossbows, firearms and pellet guns.  
         [0002]     For the projectile to land where desired, the launching device must be aligned in such a manner that the trajectory of the projectile is taken into account. A common way of aligning the launching device is to have alignment references attached to the launching device. These alignment references are referred to as an aiming device.  
         [0003]     The aiming device provides a line-of-sight reference that is a straight line in space. This line-of sight reference is aligned to the up and down plane of the trajectory of the projectile and to some point on that trajectory, which is a known distance from the projectile launcher. Thus, when the line-of-sight reference of the aiming device is aligned with a target object at that known distance, the projectile will land precisely on the target object. However, because of the trajectory of the projectile, if the distance is not the same known distance that the line-of-sight reference is aligned to and the line-of-sight reference is aligned with the target object, the projectile will land above or below the target object.  
         [0004]     To overcome this situation, some aiming devices are made to be adjustable in a manner that allows the line-of-sight reference to be moved up and down within the plane of the trajectory of the projectile. Examples of aiming devices used on bows, to adjust the line-of-sight reference for varying distances are; Slates-U.S. Pat. No. 6,430,822, Gibbs-U.S. Pat. No. 5,384,966, and Heck-U.S. Pat. No. 4,020,560. Examples of adjustable aiming devices used on guns, and crossbows to adjust the line-of-sight reference for varying distances are; Barnett-U.S. Pat. No. 6,073,351, Wilhide-U.S. Pat. No. 4,660,289, and Bass-U.S. Pat. No. 4,317,304.  
         [0005]     Aiming devices help the eye to be properly aligned with the line-of-sight reference. The most common way of accomplishing proper alignment of the eye with the line-of-sight reference is to have the aiming device consist of two points separated by distance such that when the two points are visually aligned, the eye is aligned with the line-of-sight reference. The telescopic sights use optics to superimpose a line-of-sight reference, such as crosshair, on an image of the target object and require less precise alignment with the eye.  
         [0006]     A common method of creating an adjustable line-of-sight reference on bows is to use device  40 , shown in  FIG. 1A , similar to the one described by Chipman in U.S. Pat. No. 5,697,357, immovably attached to the bowstring. Along with a device that has a movable aiming point, like the ones described by Slates in U.S. Pat. No. 6,430,822, Gibbs in U.S. Pat. No. 5,384,966 or Heck in U.S. Pat. No. 4,020,560, attached to the bow. Aligning the aiming points of these two devices creates a line-of-sight reference. This line-of-sight reference can be adjusted to different points on the trajectory of the arrow by moving the aiming point of Slates&#39;s, Heck&#39;s or Gibbs&#39;s device up or down while the aiming point of Chipman&#39;s device remains stationary.  
         [0007]     A major drawback of adjustable bow devices like Gibbs&#39;s, Heck&#39;s and Slates&#39;s is as the line-of-sight reference is adjusted for the different distances on the trajectory of the arrow, the eye must be repositioned in respect to device  40  in order to maintain proper alignment with the line-of-sight reference, as shown in  FIG. 1  and  FIG. 1A . Repositioning the eye requires the person holding the bow to use a different alignment of the muscles and skeletal structure. A different alignment of the muscles and skeletal structure for each of the distances along the trajectory of the arrow decreases the person&#39;s ability to keep the line-of-sight reference aligned to the target object and decreased the person&#39;s ability to execute the launch of the arrow in a consistent manner. The arrow must be launched in a manner that causes the arrow&#39;s trajectory to be consistent with the trajectory for which the line-of-sight reference was created.  
         [0008]     Another major drawback in using devices like Gibbs&#39;s, Heck&#39;s and Slates&#39;s is that, lowering the aiming point too far will cause it to interfere with the launch of the arrow and deflect the trajectory of the arrow from the trajectory that the line-of-sight reference is aligned to. Also when the aiming points of devices like Gibbs&#39;s, Heck&#39;s and Slates&#39;s are lowered past the point of interference with the arrow launch, the aiming points are obscured by the frame of the bow and the hand of the person holding the bow and can not be used to create a line-of-sight reference. Thus, the line-of-sight reference can not be aligned to distances that require the aiming points of devices like Gibbs&#39;s, Heck&#39;s and Slates&#39;s to be lowered until they interfere with the launch and trajectory of the arrow or are obscured by the bow or the hand of the person holding the bow.  
         [0009]     A telescopic sight is a popular line-of-sight reference use to aim firearms and crossbows. The telescopic sight is attached to the firearm or crossbow, in such a manner that the optics of the telescopic sight can be aligned to the two-dimensional plane of the trajectory of the projectile and aligned to a distance along the trajectory of the projectile. Normally, telescopic sights are made with provisions for making internal adjustment to the optics. These internal adjustments are used to align the optical line-of-sight reference to one distance on the trajectory of the projectile, as shown in Tomita&#39;s U.S. Pat. No. 5,615,487.  
         [0010]     Drawbacks of the internal adjustments are; they are inconvenient to use in the field and difficult to calibrate for different distances on the trajectory of the projectile. These drawbacks are addressed in Barnett&#39;s U.S. Pat. No. 6,073,351, Wilhide&#39;s U.S. Pat. No. 6,660,289, Bass&#39;s U.S. Pat. No. 4,317,304 and Hicks&#39;s U.S. Pat. No. 4,038,757.  
         [0011]     A drawback of Barnett&#39;s, Wilhide&#39;s and Bass&#39;s devices is the need to change eye position when the line-of-sight reference is adjusted to different points on the projectile&#39;s trajectory. Hick&#39;s device makes the internal adjustments of the telescopic sight more accessible but still difficult to calibrate for different distances.  
         [0012]     Groh&#39;s U.S. Pat. No. 6,269,581 utilizes a laser range finder, an electronic coprocessor, and a second projected crosshair inside a telescopic sight for rifles. The expense and bulk of this device is a drawback. An additional drawback of Groh&#39;s device is that the range is limited to the field-of-view of the telescopic sight.  
         [0013]     Wedge prisms are similar to lens, but are designed to bend light. The angle-of-deflection is the amount a wedge prism bends light. Wedge prisms are made with a single angle-of-deflection. In my invention two wedge prisms are mounted on a common axis of rotation and in parallel planes, the angle-of-deflection of light through the two wedge prisms becomes variable as the wedge prisms are rotated.  
         [0014]     Laser beams can be aimed by using this variable angle-of-deflection arrangement of two wedge prisms as shown in the 2002 “Optics and Optical Instruments Catalog” distributed by “Edmund Industrial Optics”. Bramley&#39;s U.S. Pat. No. 4,878,752, Wallace&#39;s U.S. Pat. No. 6,295,170, and Isbell&#39;s U.S. Pat. No. 6,172,821 uses a variable angle-of-deflection arrangement of two wedge prisms to align images in sighting devices, but not for changing the line-of-sight reference with respect to a distance on the trajectory of a projectile.  
       SUMMARY OF THE INVENTION  
       [0015]     A device for aiming a projectile launcher includes first and second light bending devices which are concentrically aligned. The light bending devices can be rotated counter to one another and the rotation is synchronized such that a line of sight of a viewer looking horizontally through the aiming device moves substantially along a straight line as the light bending devices are rotated. The aiming device is calibrated to indicate the amount of rotation necessary to cause the line of sight to pass through the point where a projectile launched by the projectile launcher will be when it reaches a particular distance.  
         [0016]     The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings. 
     
    
     DESCRIPTIONS OF THE DRAWINGS  
       [0017]      FIGS. 1 and 1 A show prior art aiming devices used on an archery bow.  
         [0018]      FIGS. 2, 2A  and  2 B show how light is deflected through aligned light bending elements as the elements are synchronously counter-rotated.  
         [0019]      FIG. 3  is a perspective view of an aiming device embodying a first embodiment of my invention.  
         [0020]      FIG. 4  is a perspective view of the aiming device of  FIG. 3  adapted for use on an archery bow.  
         [0021]      FIG. 5  is a perspective view of the aiming device of  FIG. 3  adapted for use with a telescopic sight.  
         [0022]      FIG. 6  is a distal end elevation view of the aiming device of  FIG. 3 .  
         [0023]      FIG. 6A  is in a sectional view taken along the line  6 A- 6 A of  FIG. 6 .  
         [0024]      FIG. 6B  is in a sectional view taken along the line  6 B- 6 B of  FIG. 6 , showing the components of the rotational drive system.  
         [0025]      FIG. 7  is a side elevation view of the aiming device of  FIG. 3  partially broken away to show hidden detail.  
         [0026]      FIG. 7A  is an enlarged view of the broken away portion of  FIG. 7  showing the attachment and placement of the cables used in the first embodiment of the invention.  
         [0027]      FIG. 8  is a distal end elevation view of the aiming device of  FIG. 3  with components removed to show the position of engaged rotational drive components.  
         [0028]      FIG. 8A  is a sectional view taken along the line  8 A- 8 A of  FIG. 8 , showing the position of engaged rotational drive components.  
         [0029]      FIG. 9  is a distal end elevation view, similar to  FIG. 8  but at a different rotation to show the position of disengaged rotational drive components.  
         [0030]      FIG. 9A  is a sectional view taken along the line  9 A- 9 A of  FIG. 9 .  
         [0031]      FIG. 10  is a distal end elevation view of an aiming device embodying a second embodiment of the subject invention.  
         [0032]      FIG. 10A  is a sectional view taken along the line  10 A- 10 A of  FIG. 10 .  
         [0033]      FIG. 11  is a perspective view of an aiming device embodying a third embodiment of the subject invention adapted for mounting on an archery bow.  
         [0034]      FIG. 12  is a proximal end elevation view of an aiming device of  FIG. 11  showing the linkage in a position that would cause a maximum amount of deflection of the line of sight through the wedge prisms and the means of fastening the two major sections together.  
         [0035]      FIG. 13  is a perspective view of the aiming device of  FIG. 11  showing the slots through which the linkage is connected to the wedge prisms and the linkage position such that the amount of deflection of the line of sight though the wedge prisms would be zero. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0036]     When two wedge prisms of equal angles of deflection are aligned with their thickest portions facing vertically upward, a viewer looking through them along a horizontal sight line  53  sees objects that lie along an upwardly projecting line, as shown in  FIG. 2 . This provides the maximum upward deflection of the viewer&#39;s sight line. When the proximal wedge prism  1  is rotated ninety degrees clockwise and the distal wedge prism  2  is rotated ninety degrees counterclockwise, the angle of deflection of the viewer&#39;s sight line when looking through the wedge prisms is zero, as shown in  FIG. 2A . When the proximal wedge prism  1  is rotated clockwise an additional ninety degrees, equaling a total of 180 degrees of rotation, and the distal wedge prism  2  is rotated an additional ninety degrees counter clockwise, also equaling a total of 180 degrees of rotation, the angle of deflection of the viewer&#39;s sight line when looking through the wedge prisms again becomes maximum, but in the opposite direction of the alignment, as shown in  FIG. 2B .  
         [0037]     Two wedge prisms with the same angle of deflection are located in an aiming device which allows the wedges to be rotated in a synchronized opposite manner such that a line of sight through the wedges moves along a straight line as the wedges are rotated. The amount of rotation is referenced to distances along the trajectory of the projectile, and the aiming device is calibrated to show the particular amount of rotation that corresponds to a particular distance.  
         [0038]     The subject invention provides a means to align the straight-line movement of the image produced by the synchronized-opposite-rotation of the wedge prisms with the up and down trajectory of the projectile. The aiming points that are used to create the line-of-sight reference are aligned left and right as needed by conventional means already in existence.  
         [0039]     Referring to  FIGS. 3-9 ,  6 A,  6 B,  7 A,  8 A and  9 A, an aiming device includes a shell which is made up of a base  3  and a housing  4  to which all the other components are added. The base  3  and housing  4  are made of metal.  
         [0040]     The outside configuration of base  3  needs to take into account the manner in which the aiming device is going to be mounted to a projectile launcher, such as an archery bow. Examples of some outside configurations are shown in  FIG. 4  and  FIG. 5  where a post  34  was added to the outside configuration of base  3  in  FIG. 4  and a threaded portion  37  was added to the outside configuration of base  3  in  FIG. 5 .  
         [0041]     The proximal end of base  3  has a viewing port  51  of a size as shown in  FIG. 3 , that allows for viewing the image that passes through a distal prism  2  and a proximal prism  1 . The distal end of base  3  has a counterbored hole  52  that is aligned with the viewing port  51 . Counterbored hole  52  has a diameter that allows for a slip fit with the outside diameter of proximal ring  6 . Counterbored hole  52  has a depth that allows for a slip fit with the proximal ring  6  when the housing  4 , distal ring  5 , proximal ring  6  and base  3  are assembled into a single unit. The counterbored hole  52  is cut-away on one side to provide for a micro adjusting screw  10 .  
         [0042]     A metal Micro adjusting screw  10  is attached to a pivot  11  by inserting a smooth portion of the micro adjusting screw  10  that has a diameter smaller than the micro screw ridges  48  through a hole in pivot  11  and is held in place by a metal retaining screw  13 . The head of retaining screw  13  has a larger diameter than that portion of the micro adjusting screw  10  that is inserted into a hole in pivot  11 . Retaining screw  13  is threaded into a drilled and tapped hole in the end of micro adjusting screw  10  and is tightened against the end of micro adjusting screw  11 . An access hole (not shown) must be made in the base  3  to install retaining screw  13 .  
         [0043]     Pivot  11  is made of a plastic material that provides a tight but rotatable fit around the smooth portion of the micro adjusting screw  10  that is inserted into a hole in the pivot  11 . Pivot  11  also provides for a tight but rotatable fit between the head of retaining screw  13  and the flange created on the micro adjusting screw  10  by having a diameter smaller than the micro screw ridges  48 . Pivot  11  provides a diameter that is inserted into a hole in base  3  and is at a right angle to the micro adjusting screw  10 . The diameter portion of pivot  11  is inserted into a hole in base  3  and is of a size that provides a tight but rotatable fit with the hole in base  3 . The depth of the hole in base  3 , the length of the diameter portion of pivot  11  and the portion of pivot  11  that the micro adjusting screw  10  is inserted into is configured such that pivot  11  does not extend above the surface that the housing  4  is mounted to. The hole in pivot  11  that connects with micro adjusting screw  10  is located in a location that causes the micro screw ridges  48  of micro adjusting screw  10  to be in the same plane as the proximal ring ridges  43  of proximal ring  6 .  
         [0044]     The micro adjusting screw  10  extends from the pivot  11  through a slot in base  3  that allows the micro adjusting screw  10  to move in an arc with pivot  11  as the center of that arc. The arc that the slot in base  3  allows is enough to cause the micro screw ridges  48  of micro adjusting screw  10  to engage and disengage with the proximal ring ridges  43  of proximal ring  6 .  
         [0045]     The micro screw ridges  48  of micro adjusting screw  10  uniformly spiral along a portion of the length of micro adjusting screw  10  while maintaining a consistent diameter, just like the threads on a standard screw. The proximal ring ridges  43  that are part of the outside surface of proximal ring  6  are configured such that when the micro screw ridges  48  are engaged with the proximal ring ridges  43  that the proximal ring  6  will not rotate about the line-of-sight axis  53  until the micro adjusting screw  10  is disengaged or rotated about its longitudinal axis.  
         [0046]     Micro adjusting screw  10  is held in the position engaged by a specially configured spring  21 . Spring  21  is made of metal spring wire and is shaped to apply pressure to the divots  23  that are equally spaced about the diameter of micro adjusting screw  10 . Spring  21  is shaped so that it can be attached to base  3  by metal screw  22  threading into a drilled and tapped hole in base  3 . Clearance for the placement and subsequent operational movement of spring  21  must be provided in base  3 .  
         [0047]     Spring  21  is configured such that when micro adjusting screw  10  is in the engaged position as shown in  FIG. 8  and  FIG. 8A , that spring  21  is in a relationship to divots  23  that causes the micro adjusting screw  10  to resist becoming disengaged and to resist rotating about the longitudinal axis. Spring  21  is also configured so that when the micro adjusting screw  10  is in the disengaged position as shown in  FIG. 9  and  FIG. 9A , that the micro adjusting screw  10  resists moving to the engaged position.  
         [0048]     When micro adjusting screw  10  is in the engaged position, the configuration of the micro screw ridges  48  and the proximal ring ridges  43  is such that the metal proximal ring  6  can not rotate unless micro adjusting screw  10  is rotated about its longitudinal axis. When in the engaged position and the micro adjusting screw  10  is rotated the micro screw ridges  48  exert a pressure on the proximal ring ridges  43  that causes the proximal ring  6  to rotate about the line of sight axis  53 . Because of the linkage between the proximal ring  6  and the distal ring  5 , when the proximal ring  6  rotates about the line of sight axis  53 , the distal ring  5  also rotates about the line of sight axis  53  but in the opposite direction. Because the micro screw ridges  48  are likened to a worm gear and the proximal ring ridges are likened to a ring gear, rotation of the micro adjusting screw  10  will cause controlled small changes in the relationship between the proximal ring  6  and metal distal ring  5 . These controlled small changes are used to make small adjustments to the distance settings.  
         [0049]     The metal knob  12  is attached by conventional means to the end of the micro adjusting screw. Knob  12  provides the advantage required to overcome the resistance to rotation that is caused by spring  21  and the divots  23  so the micro adjusting screw  10  can be turned by hand. Knob  12  also provides the advantage required to overcome the resistance to becoming disengaged that is caused by the configuration of spring  21  and the divots  23 .  
         [0050]     The divots  23  are equally spaced about the diameter of the micro adjusting screw  10  and provide a means to control the rotation of the micro adjusting screw  10  in incremental steps. The divots  23  also help the spring  21  to hold the micro adjusting screw  10  in the engaged and disengaged position as shown in  FIG. 8A  and  FIG. 9A  respectfully.  
         [0051]     A portion of the housing  4  is configured to have a diameter  54  that is a slip fit into the counterbored hole  52  of base  3 . The housing  4  has limited rotation about the line of sight axis  53  when the housing  4  is mounted to the base  3  and the proximal ring  6  and the distal ring  5  will continue to rotate freely.  
         [0052]     A threaded mounting hole  50  is provided in base  3  to accept the metal axis alignment screw  14 . The axis alignment screw  14  attaches the housing  4  to the base  3  through a metal washer  15  and axis-adjusting slot  32 .  
         [0053]     To align the straight up and down movement of the image seen through the proximal prism  1  and distal prism  2  with the up and down plane of the projectile&#39;s trajectory the axis alignment screw  14  is loosened and the axis adjusting slot  32  allows the housing  4  to be rotated a limited amount with respect to the base  3 . When the straight up and down movement of the image is aligned, the axis alignment screw  14  is tightened to hold the housing  4  aligned to the base  3 .  
         [0054]     A portion of the outside of housing  4  has a diameter that is a slip fit with the inside diameter of metal adjusting ring  7 . That diameter is concentric with the diameter of the distal ring  5  and overlaps a portion of the distal ring  5  on the outside of housing  4 . A distance-adjusting slot  33  is cut though that diameter to provide clearance for metal spacer  18 . A metal adjusting ring screw  16  attaches the metal indicia pointer  9 , the adjusting ring  7  and spacer  18  to the distal ring  5  through distance adjusting slot  33  and threads into distal ring attachment hole  49 . When micro adjusting screw  10  is disengaged, the adjusting ring  7  can be rotated manually about the line of sight axis  53  causing distal ring  5  to also rotated about the line of sight axis  53  the same amount. Distance adjusting slot  33  is long enough to allow the adjusting ring  7  to ring rotate the distal ring  5  one hundred eighty degrees about the line of sight axis.  
         [0055]     Metal indicia ring  8  has an inside and an outside diameter that is cut though at one point. Additional material is left on the outside diameter of indicia ring  8  at the cut point to provide for a drilled and tapped hole on one side of the cut in line with a clearance hole on the other side of the cut. The metal indicia screw  17  is inserted through the clearance hole and threaded into the drilled and tapped hole. The housing  4  provides a length of diameter for the inside diameter and length of the indicia ring  8 . When indicia screw  17  is loosened, the indicia ring  8  can then be rotated on the housing  4  about the line of sight axis  53 . When indicia screw is tightened the indicia ring  8  can no longer be move with respect to the housing  4 . The outside diameter of the indicia ring  8  is of a size that allows for the addition of a removable writing surface and still provides clearance for the indicia pointer  9 . The indicia ring  8  is used for recording and aligning customized distance indicia  45  with the indicia pointer  9 . Indicia pointer  9  points at zero on the reference indicia  44  when the adjusting ring  7  is turned as far counterclockwise as the distance adjusting slot  33  will allow. Reference indicia  44  are even spaced marks on the housing  4  that can be referenced by the indicia pointer  9  as the adjusting ring  7  rotates the distal ring  5  the one hundred eighty degrees of rotation allowed by distance adjusting slot  33 .  
         [0056]     The proximal ring  6  and distal ring  5  have an inside diameter that is concentric to the outside diameter but is smaller than the diameters of the proximal prism  1  and the distal prism  2 , respectfully. That inside diameter is concentrically counterbored to a diameter that is a slip-fit with the diameters of the proximal prism  1  and distal prism  2 , respectfully. The counterbored portions of proximal ring  6  and the distal ring  5  are configured to leave a thin portion of the original inside diameter on the distal end of the proximal ring  6  and on the proximal end of the distal ring  5 . This provides a surface that captures and aligns one side of the proximal prism  1  and distal prism  2 .  
         [0057]     The glass proximal prism  1  and the glass distal prism  2  are mounted in proximal ring  6  and distal ring  5  respectfully, using a proximal prism glue bead  19  and a distal prism glue bead  20  respectfully. Proximal prism glue bead  19  and distal prism glue bead  20  are made with epoxy type glue after proximal prism  1  and distal prism  2  are oriented in proximal ring  6  and distal ring  5  respectfully, so that when the indicia pointer  9  is pointing at zero on the reference indicia  44 , the maximum angle of deflection of the line of sight through proximal prism  1  and distal prism  2  is straight up.  
         [0058]     The distal end of housing  4  is has a viewing port  55  that allows the image to enter the distal prism  2 . The proximal end of the housing  4  is counterbored to a diameter that is a slip fit with the diameter of distal ring  5  and a portion of the diameter of the proximal ring  6  and to a depth that provides for a slip fit with the distal ring  5  when the housing  4 , distal ring  5 , proximal ring  6  and base  3  are assembled into a single unit.  
         [0059]     A portion of the proximal end of housing  4  and the counterbored hole is cut-away on one side to provide clearance for distal cable  24 , proximal cable  25 , distal pulley  28  and proximal pulley  29 .  
         [0060]     The distal cable  24  and proximal cable  25  are made of a very flexible low-stretch synthetic fiber and the distal pulley  28  and proximal pulley  29  are made of a plastic that works well as a bearing material on the metal distal pulley pin  30  and the metal proximal pulley pin  31 .  
         [0061]     Distal pulley  28  and proximal pulley  29  have holes through the center point of their diameters that are a slip fit with the distal pulley pin  30  and proximal pulley pin  29  respectively, and a concentric groove in their diameters that accommodates the distal cable  24  and the proximal cable  25  respectively. Holes are drilled into housing  4  that are a press fit on the distal pulley pin  30  and the proximal pulley pin  31  and perpendicular to the distal cable  24  and proximal cable  25  respectively. The distal pulley pin  30  and proximal pulley pin  31  are pressed into the press fit holes in the housing  4  through the center of distal pulley  28  and proximal pulley  29  respectively, and into a continuation of the press fit holes in housing  4 . This causes the distal pulley pin  30  and proximal pulley pin  31  to be supported at each end and to be axles for distal pulley  28  and proximal pulley  29  respectively. Distal pulley  28  and proximal pulley  29  have diameters with grooves that align the distal cable  24  and the proximal cable  25  with grooves in the distal ring  5  and proximal ring  6 .  
         [0062]     The two grooves cut into distal ring  5  and the two grooves cut into proximal ring  6  accommodate the diameters of the distal cable  24  and proximal cable  25  such that the distal cable  24  and proximal cable  25  do not interfere with the slip fit rotation of the distal ring  5  and proximal ring  6  within the base  3  and housing  4 . The grooves cut into distal ring  5  and proximal ring  6  are concentric with the diameters of distal ring  5  and proximal ring  6  and have equal diameters with respect to the line of sight axis  53 . The grooves cut into distal ring  5  and proximal ring  6  are spaced apart from each other such that the grooves used for the distal cable  24  align with the grooves cut into the diameter of distal pulley  28  and that the grooves used for the proximal cable  25  align with the grooves cut into the diameter of proximal pulley  29 . The distal pulley  28  and the proximal pulley  29  are positioned in the housing  4  such that their relationship with the distal ring  5  and the proximal ring  6  causes the distal cable  24  and the proximal cable  25  to be in the same plane when the cables leave, go around distal pulley  28  and proximal pulley  29  respectfully and return to the distal ring  5  and the proximal ring  6 .  
         [0063]     A distal ring cutout  46  in distal ring  5  provides clearance for a securely knotted end of distal cable  24  and a securely knotted end of proximal cable  25  around distal pin  26 . The ends of the metal distal pin  26  and metal proximal pin  27  are secured in holes drilled in distal ring  5  and proximal ring  6  respectfully. Distal cable  24  wraps clockwise around distal ring  5  in the groove cut into the diameter of distal ring  5  that aligns with the groove in the diameter of the distal pulley  28 . Proximal cable  25  wraps counterclockwise around distal ring  5  in the groove cut into the diameter of distal ring  5  that aligns with the groove in the diameter of the proximal pulley  29 .  
         [0064]     Where the clearance is provided in housing  4 , the distal cable  24  exits the groove in the diameter of distal ring  5  and goes around distal pulley  28  in the groove on the diameter of distal pulley  28 . The distal cable  24  then enters the groove in the diameter of the proximal ring  6  that aligns with the groove in the diameter of distal pulley  28  that causes the portions of distal cable  24  between the distal pulley  28  and the distal ring  5  and proximal ring  6  to be parallel to each other. The distal cable  24  then wraps counterclockwise around proximal ring  6  and terminates in a secure knot around proximal pin  27  in the clearance provided in proximal ring  6  by the proximal ring cutout  47 .  
         [0065]     Where the clearance is provided in housing  4 , the proximal cable  25  exits the groove in the diameter of the proximal ring  6  and goes around the proximal pulley  27  in the groove on the diameter of the distal pulley  27 . The proximal cable  25  then enters the groove in the diameter of the proximal ring  6  that aligns with the groove in the diameter of the proximal pulley  27  that causes the portions of the proximal cable  25  between the proximal pulley  27  and the distal ring  5  and proximal ring  6  to be parallel to each other. The proximal cable  25  then wraps clockwise around proximal ring  6  and terminates in a secure knot around proximal pin  27  in the clearance provided in proximal ring  6  by the proximal ring cutout  47 .  
         [0066]     The lengths of the distal cable  24  and proximal cable  25  are approximately equal and such that there is no slack in either one. The distal cable  24  and proximal cable  25  have ends that have been melted to form a hard ball on each individual end that is larger than the diameter of the cable that keeps the ends of the cables from pulling through the knots on the distal pin  27  and the proximal pin  27 .  
         [0067]     A single cable that is equal to the combined lengths of distal cable  24  and proximal cable  25  can replace the distal cable  24  and proximal cable  25 . The center of a single cable is securely knotted to the distal pin  26  and the two remaining portions are used just like the distal cable  24  and the proximal cable  25  are used after they have been securely knotted to distal pin  26 .  
         [0068]     With no slack in the cables, when the distal ring  5  is rotated about the line of sight axis  53  by adjusting ring  7 , the proximal ring  6  will rotate about the line of sight axis  53  in an equal but opposite direction. With no slack in the cables, when the proximal ring  6  is rotated about the line of sight axis  53  by the micro adjusting screw  10 , the distal ring  5  will rotate about the line of sight axis  53  in an equal but opposite direction.  
         [0069]     In a second embodiment, shown in  FIGS. 8, 8A ,  9 ,  9 A,  10  and  10 A the shell includes a base  3  and a housing  58  to which all the other components are added. The base  3  and housing  58  are made of metal.  
         [0070]     The outside configuration of base  3  needs to take into account the manner in which the aiming device is mounted to a projectile device. Examples of some outside configurations are shown in  FIG. 4  and  FIG. 5  where a post  34  was added to the outside configuration of base  3  in  FIG. 4  and a threaded portion  37  was add to the outside configuration of base  3  in  FIG. 5 .  
         [0071]     The proximal end of base  3  has a viewing port  51  of a size as shown in  FIG. 3 , that allows for viewing the image that passes through the glass distal prism  2  and glass proximal prism  1 . The distal end of base  3  has a counterbored hole  52  that is aligned and concentric with the viewing port  51 . Counterbored hole  52  has a diameter that allows for a slip fit with the outside diameter of metal proximal ring  41 . Counterbored hole  52  has a depth that allows for a slip fit with the proximal ring  41  when the housing  58 , metal distal ring  42 , proximal ring  41  and base  3  are assembled into a single unit. The counterbored hole  52  is cut-away on one side to provide for a micro adjusting screw  10 .  
         [0072]     A metal Micro adjusting screw  10  is attached to a pivot  11  by inserting a smooth portion of the micro adjusting screw  10  that has a diameter smaller than the micro screw ridges  48  through a hole in pivot  11  and is held in place by a metal retaining screw  13 . The head of retaining screw  13  has a larger diameter than that portion of the micro adjusting screw  10  that is inserted into a hole in pivot  11 . Retaining screw  13  is threaded into a drilled and tapped hole in the end of micro adjusting screw  10  and is tightened against the end of micro adjusting screw  11 . An access hole (not shown) must be made in the base  3  to install metal retaining screw  13 .  
         [0073]     Pivot  11  is made of a plastic material that provides a tight but rotatable fit around the smooth portion of the micro adjusting screw  10  that is inserted into a hole in the pivot  11 . Pivot  11  also provides for a tight but rotatable fit between the head of retaining screw  13  and the flange created on the micro adjusting screw  10  by having a diameter smaller than the micro screw ridges  48 . Pivot  11  provides a diameter that is inserted into a hole in base  3  and is at a right angle to the micro adjusting screw  10 . The diameter portion of pivot  11  is inserted into a hole in base  3  and is of a size that provides a tight but rotatable fit with the hole in base  3 . The depth of the hole in base  3 , the length of the diameter portion of pivot  11  and the portion of pivot  11  that the micro adjusting screw  10  is inserted into is configured such that pivot  11  does not extend above the surface that the housing  58  is mounted to. The hole in pivot  11  that connects with micro adjusting screw  10  is located in a location that causes the micro screw ridges  48  of micro adjusting screw  10  to be in the same plane as the proximal ring ridges  43  of proximal ring  6 .  
         [0074]     The micro adjusting screw  10  extends from the pivot  11  through a slot in base  3  that allows the micro adjusting screw  10  to move in an arc with pivot  11  as the center of that arc. The arc that the slot in base  3  allows is enough to cause the micro screw ridges  48  of micro adjusting screw  10  to engage and disengage with the proximal ring ridges  43  of proximal ring  41 .  
         [0075]     The micro screw ridges  48  of micro adjusting screw  10  uniformly spiral along a portion of the length of micro adjusting screw  10  while maintaining a consistent diameter, just like the threads on a standard screw. The proximal ring ridges  43  that are part of the outside surface of proximal ring  41  are configured such that when the micro screw ridges  48  are engaged with the proximal ring ridges  43  that the proximal ring  41  will not rotate about the line-of-sight axis  53  until the micro adjusting screw  10  is disengaged or rotated about its longitudinal axis.  
         [0076]     Micro adjusting screw  10  is held in the position engaged by a specially configured spring  21 . Spring  21  is made of metal spring wire and is shaped to apply pressure to the divots  23  that are equally spaced about the diameter of micro adjusting screw  10 . Spring  21  is shaped so that it can be attached to base  3  by metal screw  22  threading into a drilled and tapped hole in base  3 . Clearance for the placement and subsequent operational movement of spring  21  must be provided in base  3 .  
         [0077]     Spring  21  is configured such that when micro adjusting screw  10  is in the engaged position as shown in  FIG. 8  and  FIG. 8A , that spring  21  is in a relationship to divots  23  that causes the micro adjusting screw  10  to resist becoming disengaged and to resist rotating about the longitudinal axis. Spring  21  is also configured so that when the micro adjusting screw  10  is in the disengaged position as shown in  FIG. 9  and  FIG. 9A , that the micro adjusting screw  10  resists moving to the engaged position.  
         [0078]     When micro adjusting screw  10  is in the engaged position, the configuration of the micro screw ridges  48  and the proximal ring ridges  43  is such that the metal proximal ring  41  can not rotate unless micro adjusting screw  10  is rotated about its longitudinal axis. When in the engaged position and the micro adjusting screw  10  is rotated the micro screw ridges  48  exert a pressure on the proximal ring ridges  43  that causes the proximal ring  41  to rotate about the line of sight axis  53 . Because of the linkage between the proximal ring  41  and the distal ring  42 , when the proximal ring  41  rotates about the line of sight axis  53 , the distal ring  42  also rotates about the line of sight axis  53  but in the opposite direction. Because the micro screw ridges  48  are likened to a worm gear and the proximal ring ridges are likened to a ring gear, rotation of the micro adjusting screw  10  will cause controlled small changes in the relationship between the proximal ring  41  and distal ring  42 . These controlled small changes are used to make small adjustments to the distance settings.  
         [0079]     The metal knob  12  is attached by conventional means to the end of the micro adjusting screw. Knob  12  provides the advantage required to overcome the resistance to rotation that is caused by spring  21  and the divots  23  so the micro adjusting screw  10  can be turned by hand. Knob  12  also provides the advantage required to overcome the resistance to becoming disengaged that is caused by the configuration of spring  21  and the divots  23 .  
         [0080]     The divots  23  are equally spaced about the diameter of the micro adjusting screw  10  and provide a means to control the rotation of the micro adjusting screw  10  in incremental steps. The divots  23  help the spring  21  to hold the micro adjusting screw  10  in the engaged and disengaged position as shown in  FIG. 8A  and  FIG. 9A  respectfully.  
         [0081]     A portion of the housing  58  is configured to have a diameter  54  that is a slip fit into the counterbored hole  52  of base  3 . The housing  58  has limited rotation about the line of sight axis  53  when the housing  58  is mounted to the base  3  and the proximal ring  41  and the distal ring  42  will continue to rotate freely.  
         [0082]     A threaded mounting hole  50  is provided in base  3  to accept the metal axis alignment screw  14 . The axis alignment screw  14  attaches the housing  58  to the base  3  through a metal washer  15  and axis-adjusting slot  32 .  
         [0083]     To align the straight up and down movement of the image seen through the proximal prism  1  and distal prism  2  with the up and down plane of the projectile&#39;s trajectory the axis alignment screw  14  is loosened and the axis adjusting slot  32  allows the housing  58  to be rotated a limited amount with respect to the base  3 . When the straight up and down movement of the image is aligned, the axis alignment screw  14  is tightened to hold the housing  58  aligned to the base  3 .  
         [0084]     A portion of the outside of housing  58  has a diameter that is a slip fit with the inside diameter of metal adjusting ring  7 . That diameter is concentric with the diameter of the distal ring  42  and overlaps a portion of the distal ring  42  on the outside of housing  58 . A distance-adjusting slot  33  is cut though that diameter to provide clearance for metal spacer  18 . A metal adjusting ring screw  16  attaches the metal indicia pointer  9 , the adjusting ring  7  and spacer  18  to the distal ring  42  through distance adjusting slot  33  and threads into distal ring attachment hole  49 . When micro adjusting screw  10  is disengaged, the adjusting ring  7  can be rotated manually about the line of sight axis  53  causing distal ring  42  to also rotated about the line of sight axis  53  the same amount. Distance adjusting slot  33  is long enough to allow the adjusting ring  7  to ring rotate the distal ring  42  one hundred eighty degrees about the line of sight axis.  
         [0085]     Metal indicia ring  8  has an inside and an outside diameter that is cut though at one point. Additional material is left on the outside diameter of indicia ring  8  at the cut point to provide for a drilled and tapped hole on one side of the cut in line with a clearance hole on the other side of the cut. The metal indicia screw  17  is inserted through the clearance hole and threaded into the drilled and tapped hole. The housing  58  provides a length of diameter for the inside diameter and length of the indicia ring  8 . When indicia screw  17  is loosened, the indicia ring  8  can then be rotated on the housing  58  about the line of sight axis  53 . When indicia screw is tightened the indicia ring  8  can no longer be move with respect to the housing  58 . The outside diameter of the indicia ring  8  is of a size that allows for the addition of a removable writing surface and still provides clearance for the indicia pointer  9 . The indicia ring  8  is used for recording and aligning customized distance indicia  45  with the indicia pointer  9 . Indicia pointer  9  points at zero on the reference indicia  44  when the adjusting ring  7  is turned as far counterclockwise as the distance adjusting slot  33  will allow. Reference indicia  44  are even spaced marks on the housing  58  that can be referenced by the indicia pointer  9  as the adjusting ring  7  rotates the distal ring  42  the one hundred eighty degrees of rotation allowed by distance adjusting slot  33 .  
         [0086]     The proximal ring  41  and distal ring  42  have an inside diameter that is concentric to the outside diameter but is smaller than the diameters of the proximal prism  1  and the distal prism  2 , respectfully. That inside diameter is concentrically counterbored to a diameter that is a slip-fit with the diameters of the proximal prism  1  and distal prism  2 , respectfully. The counterbored portions of proximal ring  41  and the distal ring  42  are configured to leave a thin portion of the original inside diameter on the distal end of the proximal ring  41  and on the proximal end of the distal ring  42 . This provides a surface that captures and aligns one side of the proximal prism  1  and distal prism  2 .  
         [0087]     The glass proximal prism  1  and the glass distal prism  2  are mounted in proximal ring  41  and distal ring  42  respectfully, using a proximal prism glue bead  19  and a distal prism glue bead  20  respectfully. Proximal prism glue bead  19  and distal prism glue bead  20  are made with epoxy type glue after proximal prism  1  and distal prism  2  are oriented in proximal ring  41  and distal ring  42  respectfully, so that when the indicia pointer  9  is pointing at zero on the reference indicia  44 , the maximum angle of deflection of the line of sight through proximal prism  1  and distal prism  2  is straight up.  
         [0088]     The distal end of housing  58  is has a viewing port  55  that allows the image to enter the distal prism  2 . The proximal end of the housing  58  is counterbored to a diameter that is a slip fit with the diameter of distal ring  42  and a portion of the diameter of the proximal ring  41  and to a depth that provides for a slip fit with the distal ring  42  when the housing  58 , distal ring  42 , proximal ring  41  and base  3  are assembled into a single unit.  
         [0089]     Press fit holes have been drilled thought the housing  58  to accommodate the metal gear pins  56  that hold the metal gears  57  in place. The gear pins  56  have a diameter that is a slip fit through the gears  57  and a press fit into housing  58 . The gear pins  56  have a larger diameter that capture the gears  57  against the inside diameter of housing  58  such that the gears  57  can rotate freely.  
         [0090]     The gears  57  have an equal amount of evenly spaced gear-like ridges that are parallel to the length of the central hole that the gear pins  56  go through and the ridges are concentric to the diameter of the central hole. The ridges on the gears  57  are configured to align with and be a smooth rolling fit with ridges in the proximal end of the distal ring  42  and with the ridges in the distal end of proximal ring  41 .  
         [0091]     With only one of the gears  57  secured in place by one of the gear pins  56  the rotation of the proximal ring  41  becomes linked to the distal ring  42  such that when either the proximal ring  41  or the distal ring  42  is rotated about the line of sight axis  53 , the adjoining ring will rotate in the opposite direction about the line of sight axis  53 . More than one of the gears  57  is used to keep the rotational movements of proximal ring  41  and distal ring  42  smooth and parallel.  
         [0092]     All the gears  57  have the same number of ridges. The number of ridges on the proximal end of the distal ring  42  equals the number of ridges on the distal end of proximal ring  41 .  
         [0093]     Slack in the linkage between distal ring  42  and proximal ring  41  is minimized by using more than one of the gears  57 . The gears  57  should be positioned such that the timing of the engagement of the ridges of the gears  57  to the ridges of the proximal ring  41  and the ridges of the distal ring  42  is not the same for each of the gears  57 .  
         [0094]     A third embodiment of the invention, shown in  FIGS. 11-13 , consists of a framework made up of a base  59  and a housing  60  to which all the other components are added. The base  59  and housing  60  are made of metal.  
         [0095]     The outside configuration of base  59  needs to take into account the manner in which the aiming device is going to be mounted to a projectile device. The base  59  that is shown in  FIGS. 11, 12  and  13  is configured to facilitate the attachment of a mounting bracket  85  for an archery bow. The outside shape could be configured to incorporate a threaded portion similar to the threaded portion  37  that was added to the outside configuration of base  3  in  FIG. 5  to facilitate attachment to a telescopic sight.  
         [0096]     The proximal side of base  59  when viewed in the direction of the line of sight  53  as shown in  FIG. 12 , has a viewing port that allows for viewing the image that passes through the glass distal prism  2  and glass proximal prism  1 . The distal side of base  3  has a counterbored hole that is aligned and concentric with the viewing port. The counterbored hole has a diameter that allows for a slip fit with the outside diameter of metal proximal ring  61 . The counterbored hole has a depth that allows for a slip fit with the proximal ring  61  when the housing  60 , metal distal ring  62 , proximal ring  61  and base  59  are assembled into a single unit.  
         [0097]     A portion of the counterbored hole is cut-away to allow for the free movement of the protruding portion of the proximal ring  61  that attaches to the metal proximal ring link  63 . The cut-away portion of the counterbored hole of the base  59  starts directly opposite the portion of the base  59  that protrudes away from the counterbored hole as shown in  FIG. 13 . The cut-away portion of the counterbored hole ends at the place where the protruding portion of the base  59  starts to protrude.  
         [0098]     The portion that protrudes away from the counterbored hole of the base  59  is configured to provide press-fit alignment holes for metal alignment pins  86  and holes that are countersunk for metal flat head screws  87 .  FIGS. 11 and 13  show that portion of the base  59  configured to act as a rail along which the mounting bracket  85  can be attached.  
         [0099]     The distal side of housing  60  when viewed in the direction of the line of sight  53  has a viewing port as shown in  FIGS. 11 and 13  that allows for viewing the image that passes through the distal prism  2  and proximal prism  1 . The proximal side of housing  60  has a counterbored hole that is aligned and concentric with the viewing port. The counterbored hole has a diameter that allows for a slip fit with the outside diameter of distal ring  62 . The counterbored hole has a depth that allows for a slip fit with the distal ring  62  when the housing  60 , distal ring  62 , proximal ring  61  and base  59  are assembled into a single unit.  
         [0100]     A portion of the counterbored hole is cut-away to allow for the free movement of the protruding portion of the distal ring  62  that attaches to the metal proximal ring link  66 . The cut-away portion of the counterbored hole of the housing  60  starts directly opposite the portion of the housing  60  that protrudes away from the counterbored hole as shown in  FIG. 13 . The cut-away portion of the counterbored hole stops at the place where the protruding portion of the housing  60  starts to protrude.  
         [0101]     The portion that protrudes away from the counterbored hole of the housing  60  is configured on the proximal side to provide slip-fit alignment holes for alignment pins  86  and threaded holes for flat head screws  87 . The alignment holes of the housing  60  and base  59  are configured so that when the distal side of base  59  is mated with the proximal side of housing  60  that the counterbores at the ends of the housing  60  and base  59  are aligned and concentric to each other and the threaded holes in the housing  60  align with the countersunk holes in base  59  when the alignment pins  86  are in place. The flat head screws  87  are used to secure the base  59  to the housing  60  after the alignment pins  86  are in place.  
         [0102]     The portion of the housing  60  that protrudes perpendicularly away from the counterbored hole in the proximal side of housing  60  is configured to act as a rail that allows only linear movement of the metal slider  74  and the metal micro slider  81  along the length of the rail. The length of the rail portion of the housing  60  is determined by the amount of rotation of the proximal ring  61  and the distal ring  62  are allowed by the cutout portions of the housing  60  and base  59  to be translated into the straight line movement of slider  74  and the micro slider  81  along the rail. The distal side of that portion of housing  60  has permanent reference indicia  83  that are used to reference different degrees of orientation of the wedge prisms  1  and  2  for different distances on the trajectory of the projectile. The distal side of that portion of the housing  60  also provides a space for removable writing material so that the shooter can use customized reference indicia  84 .  
         [0103]     The proximal ring  61  and the distal ring  62  have an inside diameter that is concentric to the outside diameter but is smaller than the diameters of the proximal prism  1  and the distal prism  2 , respectfully. That inside diameter is concentrically counterbored to a diameter that is a slip-fit with the diameters of the proximal prism  1  and distal prism  2 , respectfully. The counterbored portions of proximal ring  61  and the distal ring  62  are configured to leave a thin portion of the original inside diameter on the distal end of the proximal ring  61  and on the proximal end of the distal ring  62 . This provides a surface that captures and aligns one side of the proximal prism  1  and distal prism  2 .  
         [0104]     The glass proximal prism  1  and the glass distal prism  2  are mounted in proximal ring  61  and distal ring  62  respectfully, using a proximal prism glue bead  70  and a distal prism glue bead  69  respectfully. Proximal prism glue bead  70  and distal prism glue bead  69  are made with epoxy type glue after proximal prism  1  and distal prism  2  are oriented in proximal ring  61  and distal ring  62  respectfully, so that when the slider  74  is centered between the two extreme positions possible on the rail of the housing  60  the angle of deflection of the line of sight through proximal prism  1  and distal prism  2  is zero.  
         [0105]     The proximal ring  61  and distal ring  62  each have a protrusion that extends outward from and perpendicular to the outside diameter. The protrusion is located and configured to align with the clearances cut in the base  59  and the housing  60 , respectfully. The protrusion on proximal ring  61  has a threaded hole that is used to attach one end of the proximal ring link  63  to the proximal ring  61  using metal shoulder screw  64 . The protrusion on distal ring  62  has a threaded hole that is used to attach one end of the distal ring link  66  to the distal ring  62  using metal shoulder screw  67 .  
         [0106]     The distal ring link  66  has a hole in the end that attaches to distal ring  62  that is a slip fit with the smooth diameter portion of shoulder screw  67 . The opposite end of distal ring link  66  has a hole that is a slip fit with the smooth diameter portion of shoulder screw  68  that is used to attach that end to the slider  74 .  
         [0107]     The proximal ring link  63  has a hole in the end that attaches to proximal ring  61  that is a slip fit with the smooth diameter portion of shoulder screw  64 . The opposite end of proximal ring link  63  has a thread hole that is used to attach that end to the metal straight-line adjustment piece  71  using metal shoulder screw  65 .  
         [0108]     The straight-line adjustment piece  71  has a hole that is a slip fit with the smooth diameter portion of shoulder screw  65 . The straight-line adjustment piece  71 , the proximal ring link  63  and the protrusions on proximal ring  61  are configured so that the proximal ring link  63  is parallel to the rail portion of housing  60 .  
         [0109]     The straight-line adjustment piece  71  is keyed to fit into a keyway cut into slider  74 . The metal straight-line clamping screw  73  goes through the metal straight-line washer  72  and a slot in the straight-line adjustment piece  71  and screws into a threaded hole in the slider  74 . The straight-line adjustment piece  71  and the keyway in the slider  74  are configured such that when the straight-line clamping screw  73  is loosened that the straight-line adjustment piece  71  can be moved a small amount in either direction along the keyway in the slider  74 . Then by securely tightening the straight-line clamping screw  73 , the straight-line adjustment piece  71  is securely held in the new location. This adjustability is used to make any vertical alignment changes needed to for the straight-line movement of the image seen through proximal prism  1  and distal prism  2 .  
         [0110]     The distal ring link is attached to slider  74  using shoulder screw  68  and a threaded hole in slider  74 . The slider  74 , the distal ring link  66  and the protrusions on distal ring  62  are configured so that the distal ring link  66  is parallel to the rail portion of housing  60 .  
         [0111]     The slider  74  and the micro slider  81  are configured to be captured on the rail portion of housing  60  while providing a slip fit along the rail. The slider  74  and micro slider  81  have threaded holes to accommodate the metal slider locking screw  75  and metal micro slider locking screw  82 , respectfully. The threaded holes extend to slots that are cut into the slider  74  and the micro slider  81 . The slot in the slider  74  is located and configured such that when the slider locking screw  75  is tightened by hand that a portion of slider  74  is forced against the rail causing the slider  74  to be clamped to the rail portion of housing  60  and no longer movable along the length of the rail. The slot in the micro slider  81  is located and configured such that when the micro slider locking screw  82  is tightened by hand that a portion of micro slider  81  is forced against the rail causing the micro slider  81  to be clamped to the rail portion of housing  60  and no longer movable along the length of the rail.  
         [0112]     Slider locking screw  75  and micro slider locking screw  82  have a radius on the end of the screw portion that pushes on the clamping portion of slider  74  and micro slider  81 , respectively. Slider locking screw  75  and micro slider locking screw  82  have knobs securely attached to the threaded portions. The knobs provide the leverage needed to hand tighten the radiused ends of the screw portion against the clamping portions of the slider  74  and micro slider  81 , respectively, tight enough to prevent unwanted movement of slider  74  and micro slider  81  along the rail part of the housing  60 .  
         [0113]     A viewing port is cut into slider  74  that permits the reference indicia  83  and the user indicia  84  behind the center portion of the slider  74  to be visible. The viewing port is configured to have a nonadjustable pointer that aligns with the reference indicia  83 . The viewing port in slider  74  also provides clearance for a metal movable pointer  76  to be aligned with the user indicia  84 .  
         [0114]     The metal movable pointer locking screw  78  is inserted though the movable pointer washer  77  and a slot in the movable pointer  76  and is screwed into a threaded hole in slider  74 . The slider  74  is configured so that when the movable pointer locking screw  78  is loosened that the movable pointer  76  can be moved a small amount in either direction along the user indicia  84  and will be securely held in the new location when the movable pointer locking screw  78  is tightened.  
         [0115]     The micro slider  81  is movably connected to slider  74  by the metal threaded rod  79 . One end of threaded rod  79  is securely attached to the slider  74  such that the length of the threaded rod  79  extends through two holes in the micro slider  81  and is parallel to the rail portion of housing  60 . The two holes in the micro slider  81  are a slip fit with the diameter of the threaded rod  79  and are separated by a distance that is a slip fit with the length of metal knurled adjustment nut  80 . The knurled adjustment nut  80  has a threaded hole through the center that is concentric with the outside diameter.  
         [0116]     The micro slider  81  is configured such that when the micro locking screw  82  is tightened and the slider locking screw  75  is loosened that the knurled adjustment nut  80  can be rotated about the threaded rod  79  causing controlled movement of the slider  74  along the rail portion of the housing  60 .  
         [0117]     A fourth embodiment of the invention, which is not shown in the drawings, uses two miniature electric stepper motors that are controlled and synchronized electronically. A separately mounted electronic control would contain the appropriate motor drivers, number keyboard and electronics to provide for the synchronized movement of the motors relating to input from the number keyboard. The electronics would be set up so that a distance could be entered into the keyboard and the motors would cause the wedge prisms  1  and  2  to rotate in the proper direction and the appropriate amount for that distance. The proper direction and appropriate amount would be the direction and amount that would cause the projectile to be aimed such that the projectile will hit a target at the distance entered into the keyboard.  
         [0118]     The electronics would be connected to the motors with the necessary wiring.  
         [0119]     The glass wedge prisms  1  and  2  are respectfully mounted in a metal proximal wedge prism ring and a metal distal wedge prism ring using an epoxy glue bead like proximal prism glue bead  19  and distal prism glue bead  20 . The proximal and distal wedge prism rings, each provide compatible matching thread like ridges, similar to the proximal ring ridges  43 . The distal and proximal wedge prism rings have an outside diameter that is a slip fit in a counterbored portion of a metal housing piece and a metal base piece, respectfully. The distal and proximal wedge prism rings have a length that is a slip fit with the depth of the counterbored portions of the housing piece and the base piece such that when the housing piece is fastened to the base piece, the distal and proximal wedge prism rings in the counterbores are captured and are free to rotate with little resistance.  
         [0120]     The housing piece and the base piece are configured such that they can be fastened together with a metal clamping screw going through a washer, a slot in the housing and screwed into a threaded hole in the base. The slot in the housing piece is such that when the clamping screw that holds the housing piece to the base piece is loosened the housing piece can be rotated with respect to the base piece within the limits of that slot. Then by securely tightening the clamping screw the housing piece can be securely held in the new location with respect to the base piece. This adjustability is used to make any vertical alignment changes needed to for the straight-line movement of the image seen through proximal prism  1  and distal prism  2 .  
         [0121]     A portion of the housing piece is configured to have a slip fit diameter that fits into the counterbored portion of the base piece similar to the slip fit diameter  54 . The slip fit diameter maintains a concentrically alignment of the section counterbored for the distal wedge prism ring in the housing piece with the section counterbored for the proximal wedge prism ring in the base piece.  
         [0122]     A reference slot is cut in the housing piece that is similar the distance adjusting slot  33 . The reference slot is configured to allow a metal pointer like indicia pointer  9  to be attached with a metal screw going through the pointer and appropriate spacers and screwing into a threaded hole in the distal wedge prism. The pointer will then move with the distal wedge prism. The pointer will then move along indicia similar to the reference indicia  44  that are on the outside of the housing piece providing a visual reference that indicates the alignment relationship of the wedge prisms  1  and  2 .  
         [0123]     The motors have metal output shafts that has a diameter that is configured to provide screw like ridges, like the micro screw ridges  48 , similar to a worm gear.  
         [0124]     The housing piece is configured to facilitate mounting one motor to the housing piece such that the screw like ridges on the shaft of the motor align with and are permanently engaged with the screw like ridges in the distal wedge prism ring. Clearance is provide in the housing piece for the shaft of the motor along with a means to capture the end of the shaft with a bushing. The bushing is inserted into the housing piece and is made of standard type bushing material. The bushing is immovably attached to the housing piece. The bushing has a hole that allows for the free rotation of the end of the shaft while preventing the deflection of the motor shaft ridges away from the screw like ridges in the distal wedge prism ring.  
         [0125]     The base piece is configured to facilitate mounting one motor to the base piece such that the screw like ridges on the shaft of the motor align with and are permanently engaged with the screw like ridges in the proximal wedge prism ring. Clearance is provide in the base piece for the shaft of the motor along with a means to capture the end of the shaft with a bushing. The bushing is inserted into the base piece and is made of standard-type bushing material. The bushing is immovably attached to the base piece. The bushing has a hole that allows for the free rotation of the end of the shaft while preventing the deflection of the motor shaft ridges away from the screw like ridges in the proximal wedge prism ring.  
         [0126]     Consideration must be given to how the aiming device is mounted to the projectile launcher when the base piece is configured. The location of the provisions for mounting the motors to the housing piece and the base piece motors must take into account how the aiming device is mounted to the projectile launcher and the overall application of my invention.  
         [0127]     The terms and expressions which have been employed in the foregoing specification are used therein as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding equivalents of the features shown and described or portions thereof, it being recognized that the scope of the invention is defined and limited only by the claims which follow.