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 Section Xll. SEARCHLIGHT EQUIPMENT
spherical shaped secondary reflector of alzak surfaced
5-103. General
aluminum, 4 inches in diameter. The drum is mounted on a
The purpose of the searchlight equipment is to provide
base and yoke assembly of corrosion resisting silicon
illumination for shore lines, buoys, obstructions, other vessels
aluminum castings. The base contains bronze bearings, and
and the like during night operations, or periods of poor
a bronze floating stop which allows approximately 360 of
visibility. The tugs are equipped with a 12-inch incandescent
horizontal rotation. The searchlight may be elevated or
searchlight. The optical system is housed in a watertight
drum type housing (fig. 5-131) with a watertight door. The
in the pilothouse controls both vertical and horizontal
optical system consists of 1,000-watt megul base lamp and
movement.
socket; a parabolic primary reflector constructed of silvered
glass approximately 12 1/2 inches in diameter, and a
5-188
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