Patent GB-165836-A (GB)
Title: Improvements in or relating to sighting apparatus for use with ordnance
IPC: F41G3/14
Filed: 1919-07-15
Abstract: 165,836. Vickers, Ltd., and Perham, A. L. July 15, 1919. Sights and methods of sighting.- Relates to systems of laying ordnance in which the gun is laid in accordance with indications received from a distant sighting or control apparatus, and consists in providing intermediate apparatus, situated between the sighting-apparatus and the gun, comprising devices one of which is moved in accordance with the angles received from the sighting apparatus and the others in accordance with the corrections it is desired to make, the correctional movements being mechanically added to the primary movements to give the resultant angles of gun elevation and training which are then transmitted to the gun. The intermediate apparatus preferably comprises a shaft which receives a movement representing the aggregate of the angles transmitted by the sighting apparatus and the angles of tangent elevation nr of deflection. The shaft drives a transmitter electrically connected to a receiver at the gun through mechanism by which any other desired correction can be superimposed on the movement given by the shaft to the transmitter. The invention is shown applied to the control of the elevation of guns. The movements of the sighting-telescope A in elevation are transmitted to a pointer C at the intermediate station by electrical transmitting-apparatus. The pointer C is followed by a pointer D operated by a hand-wheel E which is also connected to one element of a differential gear F which drives a shaft J. The other element of the differential gear is driven by a hand-wheel G which drives a tangent elevation dial H. The shaft J drives electrical transmitters K<1>, K<2>, K<3> connected to indicators M<1>, M', M<3> at the guns. To correct for differences in the muzzle velocities of the guns, differential gears O<1>, O<2>, O<3> are interposed between the shaft J and the transmitters, one element of each of the differential gears O<1>. O<2> being operated by gearing comprising a pinion Q<1>, or Q<2>, sliding rack R<1> or R<2>, and cam S<1> or S<2>, which is set by gearing from the tangent elevation dial. More than one correction may be applied as shown in connection with the differential gear O<3> by providing two cams S<3>, S<4> which operate a bar R<3> by means of a floating lever T. The bar R<3>, in the construction shown, simply serves as a pointer to indicate the amount of correction required, this correction then being applied to a hand-wheel X until a following pointer X<1> is brought into coincidence with a mark on the bar. Telephonic communication between the observing station and the intermediate apparatus, and between the intermediate apparatus and the gun may be resorted to in the event of failure of the electrical transmission. For training control, the dial H would be replaced by a deflection dial and the cams S<1>, S<2>, S<3> by convergence correction cranks as described in Specification 2406/15 for example. The portions of the apparatus relating to different guns can be associated in separate groups capable of being controlled independently by auxiliary sighting-apparatus.