413,236. Directing searchlights. SIEMENS - SCHUCKERTWERKE AKT.- GES., Siemensstadt, Berlin. Feb. 13, 1934, No. 4776. Convention date, Feb. 14, 1933. [Class 75 (iii).] In a sighting and stabilising system for searchlights which are mounted on a base subject to rocking, such as a ship, a control at the sighting instrument controls movements of the stabilising equipment which controls the total movement, i.e., the stabilising and sighting movements, of the searchlight and the movement of the searchlight controls the movement of the sighting instrument. As shown in the Figure, when the apparatus is idle the stabilising weights 110, 120, 130 enable the pointer 152 to remain motionless in space, movement of the pointer relative to the ship being transmitted to shafts 14, 15. Movement of the pointer in space is controlled by knob 8 at the sighting instrument 5 through motors 121, 111 and differentials 122, 112. Movements of the shafts 14, 15 control the searchlight 2 through the Ward-Leonard equipment 9, 32, 42 and motors 30, 40 and this movement controls the telescope 5 through synchronous controls 31, 41, 60, 70 and also controls counter contacts on the shafts 14, 15 through motors 140, 150. The control may be mechanical, hydraulic or pneumatic instead of electrical.
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