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The 24-Inch Searchlight Model 24-G-20 was intended primarily for signalling and secondarily for navigational use.
It consisted of a stationary base which was secured to a searchlight platform, a turntable which carried the two trunnion arms and rotated in train on the base and a drum which was pivoted on the trunnion arms to allow the drum to be elevated and depressed.
The drum contained an automatic high-intensity carbon-arc lamp which was operated from a d-c power supply.
At the rear of the drum was a Stellite metal reflector.
At the front of the drum there was a dome glass, an iris shutter for shutting off the searchlight beam and a high-speed sector-vane shutter which could be operated remotely for signalling with the searchlight beam were directly behind it.
Handles at the rear of the drum provided a means of swinging the searchlight in train and elevation to direct the beam of light.
The drum could be rotated continuously in train and between angles of 110-degree elevation and 30-degree depression.
The carbon lamp was designed for operation in series with rheostat (which was mounted below deck) from a d-c source of 105 to 125 volts.
The arc current had to be adjusted for 75 to 80 amperes with 65 to 70 volts across the arc.
One set of carbons would burn approximately 1 ¾ hours.
| Text courtesy of Instruction Book for 24" S.L.Model 24-G-20,Dtd. October 1,1942. BuShips File # S66-17S21-2,Alt.O., G.E., Schenectady,N.Y., October 1943 (2950).
USN photo submitted by Pieter Bakels.
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