Abstract:
A sight for a projectile launching device, such as an archery bow, that enables a viewing line of sight which closely matches a portion of a curved projectile path of flight to attain an extended accuracy range. The sight includes a set of mirrors arranged periscopically and mounted to the launching device. For example, the sight can be provided integrally or through mounting to an archery bow in the location and manner of traditional aiming point pin sights.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority from U.S. Patent Application 61/753,308, filed on Jan. 16, 2013, and entitled: BOW SIGHT WITH LARGE ACCURACY RANGE, the entire contents of this application being herein incorporated by reference. 
    
    
     TECHNICAL FIELD 
     The application generally relates to the field of projectile launching devices. More specifically and according to one version, this application relates to equipping a projectile launching device, such as an archery bow with a sight including an aiming device that provides extended accuracy range without the need for estimating or measuring distance to an intended target. More particularly, the sight includes a fixed set of mirrors disposed in relation to each other and arranged as in a periscope for mounting on or integration with an archery bow or other projectile launching device such that the line of sight closely matches the path of flight of the projectile over a predetermined range. 
     BACKGROUND 
     It is extremely difficult to master the art of archery as many variables affect the accurate delivery of an arrow to a desired target. One of the most difficult variables is an accurate estimation of the distance from the archer to the intended target (the “target distance”). An arrow falls to earth at an accelerating rate on its way to the target due to the effects of gravity. This is the nature of the trajectory of any projectile. The archer requires extreme accuracy in range estimation in order to effectively place an arrow at a desired target. The use of an aiming point (e.g., at least one sight pin) in conjunction with a peep sight (e.g., an eyelet hole) on the string of a bow can provide this accuracy if the exact distance to the target can be ascertained. However, a separate sight pin or adjustable sight pin is then additionally required for each incremental target distance.  FIG. 1  schematically illustrates this concept. The eye  10  of the archer (not shown) is aligned with an aiming point pin  13  located at the bow  15  to form a sight axis  17  that linearly extends through an intended target  20 . The arrow  19  must be launched by tilting the bow  15  upward at a slight angle of a few degrees, as shown, in order to overcome gravitational acceleration. This defined curve  21 , representative of the flight path of the arrow  19 , passes through the sight axis  17  at two points, a first point  25  in a proximate area in which the arrow  19  is initially launched and a second point  27  on the way down. The effective target distance is typically mapped at the second point  27  on the way down where the arrow  19  intersects the sight axis  17  at the intended target  20 . This is the distance that the archer is interested in hitting the target  20  with the arrow  19 . With a traditional single aiming point sight device and as shown in  FIG. 1 , the effective accuracy of the bow  15 , shown schematically by the boxes labeled with reference numerals  29 ,  31 , is good for only a few yards in front and behind the target  20 , respectively. 
     To that end, numerous drawbacks exist in the reliability and effective use of prior art sighting devices for archery bows as well as other launching devices in which a projectile is directed (i.e., launched) at a target and is influenced by gravity. Various target distance aiming devices (i.e., rangefinders) have been devised, including some that employ mirrors. All of these devices, however, are configured to require the user, such as a bow hunter, to make some sort of real time adjustment during the act of aiming in addition to judging the target distance. 
     In the field of archery, various bow sights have been shown for increasing the archer&#39;s accuracy, but these sights have acted merely as rangefinders. For example, U.S. Pat. No. 2,001,470 describe a folding bow having a top and bottom mirror acting as a periscope to reflect an image of the target to the eye of the archer. The lower mirror is rotationally articulated to align cross hairs on the lower mirror with the target. The lower mirror must be rotated to pre-arranged positions, which relate to various distances which the archer must estimate by other methods. 
     U.S. Pat. No. 3,163,697 shows a dual spaced mirror device arranged such that the viewer (archer) will simultaneously see both a real and a reflected target image. As a viewer looks at the target, a slide is manipulated until real and reflected images are both seen at the same height. At this position, the bow is aimed at the target and is properly positioned such that an arrow will assume the proper trajectory to the target. 
     U.S. Pat. No. 3,524,440 describes a mirror sighting device with respectively arranged upper and lower mirrors with cross hairs being added onto one of the mirrors. The lower mirror of this device is focused on the target while the upper mirror is focused on the lower mirror and reflects the target image to the archer&#39;s eye. The mirror mounting the cross hairs may be adjusted vertically in order to compensate for distance to the target. 
     U.S. Pat. No. 2,788,701 describes a device which incorporates multiple mirrors that are mounted below a single upper mirror for reflecting the image of the target and transmitting the image to the eye at various levels to facilitate trajectory adjustment of the bow for delivery of an arrow to the target. 
     U.S. Pat. No. 4,178,693 relates to an archery bow sight and range finder, including a pair of vertically spaced and laterally extending mirrors slidably mounted on a bow attached bracket and finger trigger which is actuable by the archer when grasping and aiming the bow. A center bead is associated with the lowermost mirror and the angle of the upper mirror is changed by trigger action to vary the elevation angle of the bow, with split image viewing being employed, combined with trigger action, to locate the exact range of target, one half of the target being viewed directly and the remaining half being seen through the mirrors. A lateral point of aim is determined by the lower mirror bead being positioned in the center of the combined split image. 
     U.S. Pat. No. 4,507,874 describes a bow sight which is characterized by a periscope device enclosing a top mirror and a bottom mirror to direct an image of a target to the eye of the archer. A compensating mirror is also mounted in the periscope in parallel adjustable relationship with respect to the top and bottom mirrors. A split target image is viewed in the fixed bottom mirror and comparison of this split image facilitates raising the bow to a proper angle in order to compensate for the trajectory of an arrow. 
     U.S. Pat. No. 4,555,856 describes a bow sight which includes, a housing enclosing a bottom mirror, a top mirror mounted in spaced relationship in the housing with respect to the bottom mirror and a narrow compensating mirror positioned in the housing in close proximity to the bottom mirror. The top and bottom mirrors are mounted in substantially parallel relationship at approximately a 45 degree angle in the housing and the top mirror and the compensating mirror are pivotally mounted with the compensating mirror adjustably responsive to manipulation of a lever from a calibrated position. The target image segment projected from the top mirror to the bottom mirror is compared to the target image segment projected from the compensating mirror to the bottom mirror and the lever is moved in order to provide the necessary adjustment to align the segments and determine a proper trajectory for accurately delivering an arrow to the target. 
     U.S. Pat. No. 4,979,309 describes a range finding bow sight for archery bows which includes a frame on which are mounted upper and lower mirrors in a substantially parallel relationship at a 45 degree angle and vertically aligned with each other forwardly of the bow. The top mirror is pivotally mounted and adjustably responsive to manipulation of a lever, which cooperates through a programmed cam segment on a rotationally mounted sighting plate to which is attached a sight pin. Movement of the actuating lever correspondingly shifts the upper mirror to permit alignment of the actual target image with a reflected target image from the lower mirror. Movement of the actuating lever simultaneously positions the sight pin to provide the necessary elevation of the bow for the proper trajectory of the arrow to the target. The programmed cam section is removable and can be shaped to match the performance characteristics of the archery equipment being used. 
     None of the above-noted prior art, nor any that Applicants are presently aware, solve the general and persisting need in the archery industry, at a minimum, to provide a sight that is readily adaptable to long bows, recurve bows, compound bows, cross bows, and other projectile devices, which can accurately aim over various distances between the user and an intended target without the need to estimate or measure the target distance. 
     BRIEF DESCRIPTION 
     By way of example, and as clearly shown in  FIG. 1 , a fundamental problem with archery bow sights is that the path of flight  21  of the arrow  19  is defined by a curve, while the visual line of sighting  17  of a bow sight is defined by a straight line, therefore making it necessary to have a separate line of sight for each known target distance. The arrow launch must be angled upward precisely to compensate for the gravitational acceleration acting to pull the arrow  19  to the ground. Typically and with reference to  FIG. 1 , the location of an adjustable aiming point pin  13  is mounted to the bow frame  15  that the archer (e.g., a bow hunter) aligns with his/her eye  10  to create a visual aim line or line of sight  17  at a target  20 . By trial and error, the hunter will adjust the aiming point pin location for elevation and windage (up/down and left/right) until the arrow strikes the intended target accurately at a given target distance. The hunter must then repeat this process for several other target distances, using a separate aiming point pin (not shown) for each target distance. Alternatively, another type of known sight requires vertical adjustment of a single pin (i.e., up and down) using a lever mechanism to create multiple aim points. In this latter case, the calibration requires the archer to mark the lever position for each calibration target distance. During use, the archer would have to move the lever to the appropriate marking based on the target distance. In either known instance, the hunter is expected to judge the target distance and then select the correct line of sight (aiming point) for that distance. 
     This aiming method would be adequate if the archer always knew the exact distance to the targets that randomly appear, such as those commonly occurring while hunting. Distance judging and sight adjustments during use is a source of accuracy error. Not knowing the distance means the hunter must quickly judge the distance to the best of his/her ability and often times is wrong, thus having sometimes a large error between the aiming sight and the arrow flight. As a result, the intended target is missed. 
     According to the present invention, the solution to the above-noted problem is to create a line of sight that substantially fits an extended portion of the arrow flight curve that is of most interest to the hunter or archer. For example and in the northeastern part of the United States, a typical target range for hunting is between about ten and thirty yards (meters). In this regard, it is most difficult to judge distance and risky to shoot much beyond thirty yards (meters) and seldom do hunters get closer than ten yards (meters) to their prey. The line of sight that best fits the arrow flight curve, just described, is therefore a line that crosses the path of arrow flight slightly beyond the ten yard (meter) mark and slightly before the thirty yard (meter) mark. This line is a downward sloping sight line that closely matches the curved path of arrow flight from the apex of the arrow path to the target and significantly reduces the error between the aiming sight view and the path of the arrow over the range. The created sight line is the best fit line to approximate the curve of the given range of distance. 
     To enable this line of sight, it is necessary to create an elevated line of sight emanating from above the arrow at the bow. In accordance with this invention, a set of mirrors are arranged, such as in a periscope, to create the required elevation. According to at least one version, the mirror set is mounted along with an aiming point pin to the bow in the same manner as a typical aiming pin sight. In this version, the adjustments for aiming are the same as described for typical bow sights in that the pin must be aligned with the hunters&#39; eye to create a line to the target. The difference between a traditional aiming arrangement and the present invention is that that the line being viewed through the mirrors closely matches that of an extended portion of the arrow path of flight, correspondingly creating an extended accuracy range. Thus, only a single pin or other aiming point indicator is required for the entire range. 
     According to at least one aspect, the herein described sight can be releasably or fixedly mounted to a bow and calibrated at a specific target distance for best fit line of sight to the arrow flight curve by means of a windage and elevation (left/right and up/down) device in the same manner that a traditional bow aiming point sight is calibrated. Once calibrated, the bow sight will be accurate for an extended accuracy range and without the need to further calibrate the sight for multiple distances. That is to say, no further adjustments are required following an initial one time calibration. 
     The extended range of accuracy is defined by a range in which the difference between the aiming sight and arrow flight is less than an acceptable amount of error. Typically, accuracy within about 2 inches (50 cm) is desirable. The herein described device is capable of achieving this goal over a wide range of arrow speeds; typically arrows traveling between 250 to 350 feet per second (fps); that is, about 80 to 110 meters per second (mps). The fitted range of the arrow path is not limited to what is previously mentioned and can be suitable adjusted as needed during a single initial calibration. For example and for slower arrow speeds than those noted above, the accuracy range will be somewhat shorter and for faster arrow speeds, the accuracy range can be further extended. 
     According to one described embodiment, the vertical separation or spacing between the mirrors of the herein defined periscope for the bow sight is about 4 to 6 inches (10 to 15 cm). It will be understood, however, that this vertical separation can be augmented depending, for example, on the range of distances and arrow speeds. According to one version, the mirror separation can be preset by the manufacturer. According to another version, the bow sight may be built such that the customer can preset or prefix the vertical spacing. The separation choice can be based upon accuracy tolerance and the accuracy range desired for a given arrow speed. 
     Therefore and according to one version, there is provided an archery bow sight comprising a housing and a pair of mirrors arranged within the housing to create a periscopic view. The mirrors are fixed relative to each other, wherein a raised line of sight is created by the alignment of a user&#39;s eye and an aiming point within the periscope view that closely matches a predetermined portion of the flight path of an arrow and thereby providing an extended accuracy range which is defined by the created line of sight. 
     The herein defined sight can utilize a single aiming point which is useful over the extended accuracy range. Additional aiming points can be used according to one version for targets that are outside of the extended accuracy range. 
     According to another version, there is provided a method for increasing the accuracy range of a bow. The method comprises the steps of providing a bow sight having a pair of mirrors arranged to create a periscopic arrangement and aligning a line of sight through the pair of mirrors along a predetermined portion of an intended arrow travel path with respect to a target and creating an aiming point that is aligned with the elevated line of sight over the entire portion of the arrow travel path. 
     According to yet another version, there is provided a sight for a projectile launching device, the sight comprising a housing and a pair of mirrors arranged within the housing to create a periscopic view. The mirrors are fixed relative to each other, wherein a raised line of sight is created by the alignment of a user&#39;s eye and an aiming point within the periscope view that closely matches a predetermined portion of the flight path of a launched projectile and thereby providing an extended accuracy range which is defined by the created line of sight. 
     The elevated line of sight that is created is a best fit extending over the predetermined portion of the intended arrow path, which therein defines the extended accuracy range provided by the sight. 
     One exemplary object of this application is to fulfill the above-noted needs using a stationary single sight aiming point device. 
     Another further object is to provide an improved accuracy range sight which is applicable to various bow designs and can be calibrated in cooperation with existing windage and elevation (left/right and up/down) adjustment mechanisms. 
     Yet another object is to provide an improved accuracy range utilizing a single aiming point sight which closely tracks the trajectory of a launched projectile, such as an arrow, over a range of target distances. 
     Still a further object of this invention, is to make it as easy for the user of a projectile launching device to hit a desired target with the least amount of complexity and practice. 
     An advantage of the herein described sight for the bowhunter is that he/she has an accurate line of sight relative to the arrow fight path and is relieved of the need to judge distance to the target. 
     A further advantage is that a single pin or other aiming point indicator will eliminate the confusion as to which of a multiple number of aiming point pins to sight on, as found in a traditional bow sight. As a result, the herein described sight prevents improper selections of an incorrect aiming point for a given target distance, in which making an accurate decision before shooting the bow can be made when time is of the essence. 
     Another advantage provided is that the herein described bow sight creates time savings during the calibration process for windage and elevation (left/right and up/down), since calibration is only required for a single aiming point pin at a single target distance rather than having to sequentially calibrate multiple aiming point pins at multiple distances. 
     Still another advantage is that there are no moving parts to adjust once the initial set-up calibration of the bow sight is completed, allowing the hunter to point and shoot with minimal concern for the equipment. 
     These and other features and advantages will be readily apparent from the following Detailed Description, which should be read in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  illustrates a schematic side view of the arrow flight and line of sight of a traditionally known archery aiming point pin sight arrangement; 
         FIG. 2  illustrates a schematic side view of the arrow flight and line of sight using a bow sight made in accordance with the present invention, comparatively illustrating an increase in accuracy range; 
         FIG. 3  is an illustrated cross-section of an exemplary bow sight of the present invention; 
         FIG. 4  is an illustrated cross-section of a bow sight made in accordance with another exemplary embodiment, further including a ring that is disposed about the aiming point of the bow sight; 
         FIG. 5A  is an illustration of an image view taken through an exemplary bow sight according to the present invention in which the image view converges with the surrounding view; 
         FIG. 5B  is an illustration of the image view taken through the bow sight in which the image view does not converge with the surrounding view; and 
         FIG. 6  is a perspective view of an elevation and windage (left/right and up/down) mechanism with a traditional multi-pin bow sight attached. 
     
    
    
     DETAILED DESCRIPTION 
     The following description relates to exemplary embodiments for a stationary single aiming point bow sight that effectively and significantly extends the accuracy range of an archery bow. It will be readily apparent, however, that the concepts described herein are equally applicable to other devices capable of launching a projectile at an intended target under the influence of gravity. Throughout the course of discussion, several terms are frequently used in order to provide a suitable frame of reference in regard to the accompanying drawings. These terms, which include “top”, “bottom”, “upper”, “lower” and the like are not intended to restrict the overall scope of the invention, including the appended claims, except where so specifically indicated. In addition, the accompanying drawings are intended to depict the salient features of the present invention. In this regard, the drawings provided herein are not necessarily drawn to scale. 
     Referring to  FIG. 2 , an exemplary archery bow sight  100  is herein shown schematically, the bow sight  100  being configured to significantly improves the accuracy range (shown as  106 ) of an arrow  102  as it strikes targets  112  at varying distances, as measured from the archer&#39;s bow  104 . The improved bow sight  100 ,  FIG. 2 , is shown side by side with the traditional bow sight as depicted in  FIG. 1 , in which the improvement line of sight  118  is depicted relative to a traditional line of sight  17 . As previously discussed according to  FIG. 1 , the traditional line of sight  17  intersects with the arrow path  21  at only two points of accuracy  29 ,  31  in which the arrow path  11  intersects the sight axis  17  of the bow  15 . The improved bow sight  100 , on the other hand, is based on the concept of creating an aiming line of sight  118  that is an approximate fit with a significant portion of the curved arrow path  121 , which defines an extended accuracy range  106 . 
     With continued reference to  FIGS. 2 and 3 , the bow sight  100  is further described. In brief, a line formed by the eye  101  of the archer and a stationary aiming point indicator, such as aiming point pin  105 , creates a line of sight  118 . This line of sight  118  is caused to reflect off a angled lower mirror  124  to an upper mirror  128 , each of the mirrors being supported in a housing  103 , wherein the line of sight is then directed outwardly toward a target  112  from the bow  104 . The mirror set  124 ,  128  creates a periscope that effectively elevates the line of sight  118  that emanates from the bow  104 . The periscopic line of sight  118  is near tangent to the arrow flight curve  121  but, slightly severs the curve with minimal error over the large accuracy range  106 . 
     As noted, the aim point indicator that is used in the herein described bow sight  100  can be a physical standing pin  105  or alternatively can be a reticule or a marking (not shown) that is provided on one of the mirrors  124 ,  128  to enable easy reference by the archer. In that regard, it is desirable for the aim point to stand out for visualization, such as by illumination of the aim point. For example, radium or other absorbing and fluorescing material can be used for this purpose. The aiming point pin  105  may also be defined by the end of a fiber optic that glows brightly for visualization by means of absorption of ambient light. This aim point also may be alternatively transmitted through from the backside of either the lower mirror  124  or upper mirror  128  of the defined sight  100 . Commonly, fiber optics are made to glow by means of black light during low ambient light conditions. 
     Referring to  FIGS. 3 and 4 , a bubble level  154  can be added near the line of sight  118  to aid the hunter in holding the bow  105  in a suitable vertical position. 
     It may be advantageous or convenient to add a fine tuning elevation and windage adjustment (not shown) to the aiming point pin  105  separate from a primary windage and elevation mechanism  144 - 147 , such as the mechanism which is shown in  FIG. 6 . 
     In terms of an arrow flight path and for purposes of this described embodiment, a typical arrow speed of about 300 feet per second (100 meters per second (mps)) will raise about 4 inches (10 cm) mid-range in flight to a target at 30 yards (30 meters). Using a sight  100  having a vertical spacing of about 4 inches (10 cm) between the mirrors  124 ,  128 , the sight accuracy to arrow flight will be improved to less than 1.0 inch (2.5 cm) error over a 10 to 30 yd (10 to 30 m) target distance, which as discussed previously is a prevalent distance range used by bowhunters. Using the same described bow sight  100  with slower speed arrows, the same accuracy can be similarly provided for a substantially proportional and shorter range. For example, 200 fps arrows will be accurate to within about 1.0 inch (2.5 cm) from approximately 7 to 20 yd (7 to 20 m). Conversely, faster arrows will correspondingly push out (expand) the accuracy range almost proportionally. The defined vertical separation of the mirrors  124 ,  128 , along with the arrow speed and the amount that the line of sight  118  severs the arrow flight path  121  will determine the accuracy error size, the location and length of the accuracy range  106 . 
     Referring to  FIG. 5A , the viewing alignment, i.e., the pre-set angles of the top and bottom mirrors  124 ,  128 , of the herein described bow sight  100 ,  FIG. 3 , is fixed such that the view  136  by the archer through the bow sight  100  converges with the surrounding view  140  at a target distance within the accuracy range  104 , as shown. 
     Referring to  FIG. 6 , a calibration for windage and elevation (left/right and up/down)  144  through  147  are made during calibration set-up, as with all point pin sights  13 ,  FIG. 1 , and multi-aiming point pin sights  151 . The herein described bow sight  100  is preferably made such that it will mount to right and left handed bows. In a preferable orientation, the attachment location of the bow sight  100  should be provided near the balance point between the mirrors  124 ,  128  in order to avoid vibration. This mounting, however, will require a dogleg shape to a mounting bracket in order to use typical standardized bow mounting screw locations. 
     Though the vertical spacing or separation between the top and bottom mirrors  124 ,  128  of the bow sight  100  is preferably fixed during use, the housing  103  can be configured such that this spacing can be adjusted, as may be required during manufacture or calibration set-up for the optimization of the line of sight  118  with the arrow flight path  121  given a range of arrow speeds. The adjustment in vertical separation of the mirrors  124 ,  128  can be accomplished by several methods. For example, the mirrors  124 ,  128  could be mounted on a slide (not shown) with a locking screw, or the mirror assembly can be rotated to change the vertical separation while maintaining the overall physical separation (angular) between the mirrors. Other suitable means for reliably providing this separation can also be utilized. 
     In terms of overall construction, the top mirror  128  can be made slightly larger than the bottom mirror  124  so that the resulting view  133  through the bottom mirror  124  is not clipped and also to allow for manufacturing tolerances. The mirrors  124 ,  128  of the herein described bow sight  100  may literally be of any shape, though most common shape choices can include square, rectangular, circular and/or oval. 
     Once calibrated, all adjustments are fixed so that the archer can point and shoot the bow using a single aiming point pin  105 ,  FIG. 3 . Typically, the angles of each mirror  124 ,  128  and their relative spacing will be fixed by the sight manufacturer for a common range of arrow speeds and accuracy ranges  106 . The only calibration typically required by the archer will be for windage  146 ,  FIG. 6 , and elevation  147 ,  FIG. 6 . These forms of calibration are typically referred to as “two axis” adjustments. More advanced modern bows have additional adjustments for special cases, thus creating 3 rd , 4 th  and even additional axes adjustments. 
     As previously noted and according to  FIG. 5A , the image seen through the periscope view  136  by the archer is converged with the surrounding view  140 . Convergence can happen at only one location, so it is desirable that convergence occurs within the created accuracy range  106  such that there is little discrepancy from convergence for the hunter during use.  FIG. 5B  shows the sight (periscopic) image view  136  that is not converged with the surrounding view  140 . The image appears disjointed and may be confusing, if it becomes too great. 
     Referring to  FIG. 6 , traditional aiming point pin bow sights often include a circular ring  151  surrounding a plurality of aiming point pins  152 . The circular ring  151  aids the hunter to align the eye  101 ,  FIG. 4 , with the aiming point pin  105  of interest to create the line of sight  118  repeatedly. Referring to  FIG. 4 , the bow sight  100  can be modified to include a circular ring  164  similar to that of  FIG. 6  but for the single aiming pin or indicator. Other techniques used in traditional aiming point bow sights can also be applied to this invention such as adding a large radius to the elevation mechanism  147 ,  FIG. 6 , the radii approximating the distance from the aiming point pin to the user&#39;s eye at full draw. This is a known technique to improve the perpendicular of the eye  101  to the aiming point pin  105 . 
     Further design considerations to the herein described bow sight can include sealing the housing  103  such that moisture and condensation are limited to external window surfaces. The sealed sight may further require a dry gas fill or moisture absorbing materials. It may also be desirable to provide a protective storage bag or snap on protective hood for when the bow sight is being transported and not used. 
     It is preferred that the herein described bow sight have a durable and rugged construction, for example, to enable routine use by hunters in the wild. In the herein described version, the sight can be made from a structural molded plastic having glass mirrors. For example, 10 to 30% glass filled, black PC-ABS is a suitable choice. A combination of plastic and metal is also practical, using the metal for structure. Alternatively, the sights can be manufactured from a durable light weight metal such as, but not limited to aluminum alloy, magnesium, and titanium. For example and for a high-end product, the above noted metals could be utilized. First surface mirrors  124 ,  128  provide the best quality image given that second surface mirrors typically have a faint ghost image reflection from its&#39; non-mirrored first surface. However, second surface mirrors are more robust and economical. 
     In addition, it is known that bows are often made with a camouflage finish. Therefore and according to one version, providing a camouflage finish on the exterior of the herein described sight will match the bow, thereby making the equipment invisible in the field. 
     PARTS LIST FOR FIGS.  1 - 6   
     
         
           10  eye (archer) 
           13  aiming point pin 
           15  bow 
           17  sight axis 
           19  arrow 
           20  target 
           21  curved arrow path 
           25  first point of intersection 
           27  second point of intersection 
           29  accuracy point 
           31  accuracy point 
           100  bow sight 
           101  eye, archer 
           103  housing 
           104  bow 
           105  aiming point pin 
           106  extended accuracy range 
           112  target 
           118  line of sight 
           121  arrow path 
           124  top mirror 
           128  bottom mirror 
           133  field of view 
           136  image view (sight) 
           140  surrounding view 
           144  calibration mechanism (windage and elevation) 
           145  calibration mechanism 
           146  calibration mechanism, windage 
           147  calibration mechanism, elevation 
           151  circular ring 
           152  plurality of aiming points 
           154  bubble level 
           164  circular ring (bow sight) 
       
    
     It will be readily apparent that other variation and modifications are possible within the intended ambits of the herein described bow sight, including those recited according to the following claims.