Fecha de publicación: 19/03/1903 Fuente: WIPO "pollen" 6838. Lock, W. H., Pollen, A. H., and Barr, M. March 20. Telemeters.-Relates to mechanical apparatus for the determination of the linear elements of triangles, for telemetrical purposes, which is based upon the following trigonometrical principles :- In the triangle, Fig. 1, If, now, along inclined axes 0 P, 0 Q, Fig. 2, lengths o c, o a, and o b are set off, equal, respectively, to constant multiples of the quantities S. sin (A-B), and sin B, then, by drawing d b parallel to a c, the length L will vary as the length R ; i.e., if R is the distance of an object E from the base line S, it can be determined from the length L. The solution is effected mechanically by the apparatus shown in Fig. 5. In grooves 3, 4 the pivots a, b, c, d, of two bars 1, 2 are adapted to slide and be adjusted. These bars are constrained to move parallel to one another. Since, in practice, the angle A-B is never more than about 36', the distance o a is set off against an angular scale 15 by means of a screw 5 and micrometer head 18 acting directly on the pivot a. In the case of the pivot b, however, used for setting off the value of sine A, the adjusting-screw 6 acts upon it through the intermediary of a sine-cam 10. The corresponding angle is read off on the scales 11, 12. The distance o c corresponding to the base length S is set by a screw 7 and micrometer head 24 against scales 20, 25. To determine a range, therefore, the pointers 20, 25 are first set to the base employed. Of the angles A, B, the first is then set off with the pointers 11, 12, and the difference between it and the second against the pointers 15, 16a ; the range R is then read off directly on the scale 19 opposite the pointer 19.