Patent GB-352470-A (GB)
Title: Improvements in calculating apparatus for transforming co-ordinates
IPC: G06G3/00
Filed: 1930-03-31
Abstract: 352,470. Apparatus for transforming co-ordinates. ZEISS, C. [Firm of], Carl Zeiss-Strasse, Jena, Germany. March 31, 1930, No. 10128. Convention date, April 9, 1929. [Class 106 (i).] Plane - trigonometry calculators.-Mechanism is so arranged that, when certain members are set in accordance with the two co-ordinates (X1<SP>1>, Y1<SP>1>) of a point with respect to one system (Xl, Y<1>) of rectangular coordinates, other members indicate the co-ordinates (X1, Y1) of that point with respect to a second co-planar system (X, Y), the two systems having a common origin and being inclined at a given angle (alpha) to each other. In one embodiment, Fig. 2, a slide 8 is set by screws 2, 3 operated by a handle 7 until the value Y1<SP>1> is indicated on a scale 37. The value X1<SP>1> is set by moving a block 9 along the slide 8 by means of a screw 10, wheels 11, 12 (the latter being slidably keyed to a shaft 13) and a handle 15. Two levers 22, 23 can be adjusted relatively to each other in accordance with the angle alpha between the two co-ordinate systems, and they are then clamped together to rotate about a pivot M-M. A slot in the lever 23 engages a pin 25 secured to the block 9, and a slot in the lever 22 engages a pin 20 fixed to a block 19 which slides along a slide 16, the latter itself being slidable on guides 17, 18. Pivoted to the pins 25, 20, are equal links 33, 32 connected to a member 30 slidable on a rod 29 freely pivoted at M-M. At equal distances along the links 32, 33 are pivoted equal links 34, 35 connected to a second slider 31. The distances of the pins 20, 25 from the centre M-M are thus maintained equal. When the handles 15, 7 are set to the values X1<SP>1>, Y1<SP>1>, the required values X1, Y1 are indicated on the slide 16 and guide 17 as shown. In a second embodiment, Fig. 4, the slide 16 is guided on members 17, 18 forming part of a frame 44 which can rotate about the pivot M-M and which is clamped at an angular setting alpha as shown on a scale 47. The block 9 is operated in the same manner as described with reference to Fig. 2, and it carries a pin entering a recess in a block 19 sliding on the slide 16, the latter itself sliding on the guides 17, 18. The required values are indicated at 17, 16 as in the previous form. A third embodiment is shown in Fig. 6. In this case the value X1<SP>1> is set by a handle 70 attached to a screw 69 carrying a block 71 having a pointer 73. The screw 69 is connected by gearing 68, 67 to a sleeve 66 loose on a shaft 63 and carrying a bracket 65 on which is rotatably mounted the planet wheel 64 of a differential gear 61, 64, 62. The value Y1<SP>1> is set similarly by a handle 80. To the shafts 60, 89 of the differential gears is connected a shaft 90 by gearing r2<SP>1>, r1<SP>1> and r2, r1, this shaft 90 being geared to a screw 92 carrying a block 93 having a pointer 95 which indicates the required value Y1 on a scale 96. The shafts 63, 82 are connected to a similar shaft 97 by gearing r4<SP>1>, r3<SP>1> and r4, r0, r3, this shaft being connected to a screw 99 bearing an indicating block 100 for the required value X1. The gear ratios r1, r2 ; r1<SP>1>, r2<SP>1> ; r3<SP>1>, r4<SP>1> ; and and r3, r4 are determined by the angle alpha, and different gear ratios for different angles are obtained by moving two knobs 54, 55 bearing pointers 56, 58 situated adjacent to scales 57, 59. The additional gears are not shown. The Specification as open to inspection under Sect. 91 (3) (a) states also that the apparatus may be adapted for the transformation of threedimensional co-ordinates. This subject-matter does not appear in the Specification as accepted.