. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 CEILING LIGHT PROJECTOR ML-121 The Ceiling Light Projector ML-121 (fig. 5-4) consists of a drum and an optical system. The drum is a weatherproof one-piece casting which holds the various parts of the projector in their correct positions. Leveling perches, 90° apart, are adjusted so that the beam is directed at the zenith when both perches are level. The optical system consists of the lamp, primary reflector, secondary reflector, socket assembly, supporting base, and transformer. The pr
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 CEILING LIGHT PROJECTOR ML-121 The Ceiling Light Projector ML-121 (fig. 5-4) consists of a drum and an optical system. The drum is a weatherproof one-piece casting which holds the various parts of the projector in their correct positions. Leveling perches, 90° apart, are adjusted so that the beam is directed at the zenith when both perches are level. The optical system consists of the lamp, primary reflector, secondary reflector, socket assembly, supporting base, and transformer. The primary reflector is a parabolic mirror constructed of silvered, high-transmission glass, while the secondary reflector is a spherical, silvered glass mirror, both of which do not crack when subjected to repeated heating and cooling cycles. The secondary reflector is held in a spherical reflector holder which is rigidly mounted on an arm of the socket assembly so that the focal points of the reflector and lamp coincide. SOCKET ASSEMBLY DOOR CLAM SECONDARY REFLECTOR DOOR CLAMP. COVER GLASS DOOR LAMP PRIMARY REFLECTOR DRUM TRANSFORMER TRANSFORMER HOUSING CONVENIENCE OUTLET LEVELING PERCH SLIP FITTER Figure 5-4. —Ceiling light projector ML-121 detail. The socket assembly consists of a cast aluminum or iron base and is located so that it supports the lamp at the focal point of the secondary reflector. The base of the projector is a single casting for both the transformer housing and slip fitter. The slip fitter is designed to fit over a 4-inch standard pipe with sufficient play to permit leveling of the drum by four setscrews. Operation The ceiling light projector should be in- stalled so that a standard baseline (horizontal distance from projector to observation point) near 800 feet can be established and so that supplementary baselines near 400 and 1,600 feet can be marked when practicable. The 400-foot baseline is for use when clouds are below 500 feet; the 1,600-foot b
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Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
