Patent GB-190711607-A (GB)
Title: Improvements in or relating to Sighting Apparatus for Guns.
Inventor: DAWSON ARTHUR TREVOR
Filed: 1907-05-17
Granted: 1908-02-26
Abstract: 11,607. Dawson, A. T., and Buckham, G. T. May 17. Sights and methods of sighting.-Relates to means whereby the sighting-apparatus of guns is automatically set for range and deflexion from a distant fire-control station. The invention is shown in Figs. 1 and 2 applied to sighting-apparatus of the cross-connected type, in which sight-bars A, A' hinged to a bracket A<2> are connected by a transverse shaft A<3> and a rod A<4>, the shaft A<3> imparting simultaneous elevation, and the rod A<4> imparting simultaneous deflexion, to the sight - bars. The general arrangement of apparatus is shown diagrammatically in Fig. 6. At the fire control station are provided electric transmitters each comprising a rotary hand-switch Ax controlling a light motor which works in synchronism with a similar motor b<3> or b<1> in one of the receivers B<1> or B<3>; this receiver motor controls, through a switch, one of the motors C<1> or C<2>, geared respectively to the elevating and deflexion gear and supplied with a heavy current from the mains 1, 2. The receivers B<1>, B<2> are alike in action and construction. The motor C<1> elevates the sighting-apparatus through worm and tooth gearing and a rack d<6> in the usual manner, and the motor C<2> operates the usual deflecting-screw through the gearing shown. A shaft b<1> forming part of the receiver B<1>, Fig. 4, is driven by bevel-gearing c<9>, b from the motor C<1>. The shaft b<2> of the receiver is capable of rotation in either direction by means of ratchet-wheels b<9>, b<10> and pawls b<7>, b<8> carried by pivoted arms operated by electro-magnets b<3>, b<4>, as described in Specification No. 10,650, A.D. 1907, [Abridgment Class Electricity, Regulating &c.]. A drum E, which rotates with, but is free to slide longitudinally on the shaft b<2>, carries a contact-piece e ; a second drum D, free to rotate on the spindle b<2> when driven from the shaft B<1> through worm-gearing b<x>, d, carries three insulated contact-rings d<1>, d<2>, d<3>, the rings d<1>, d<3> being electrically connected together. The rings d<2>, d<3> are provided with spiral grooves, and each groove passes at one end by a steep groove to an insulated piece d<5>. Brushes e<5>, d<7>, d<6> engage respectively the drum E and rings d<2> d'. Electromagnetic switches G, H control the direction of rotation of the motor C<1>. In operation, the motor C' is at rest when the contact e is on the insulated piece d<5>. If the transmitter A<x> is operated to bring into action the motor b<4>, a step - by - step motion is imparted to the drum E and the contact e moves on to the drum d<3>, thus completing the circuit 3, e<5>, e, d<3>, d<1>, d<6>, G, 4, and also completing the motor circuit 1, 2 at g<1>, g<2> and operating the elevating-motor C'. The drum E travels to the left, Fig. 4, on the shaft b<2>. At the same time, the drum D is rotated through the shaft b<1> to counteract this motion, so that, when the rotation of the shaft b<2> ceases, the drum D continues to rotate and brings the contact e back to the insulated piece d<5>, thus stopping the motor C<1>. If the transmitter Ax is operated to start the motor b<3>, the contact e is similarly moved on to the ring d<2>, the contacts h<1>, h<2> are closed, and the motor C' and all the other parts move in the reverse directions until the contact e is again brought over the piece d'.