Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 81
ts which werecarried out, it was found that a 20-inchProjector burning 60 amperes at 50 voltsacross the horizontal arc, and fittedwith a parabolic silvered glass mirrorhaving a 12-inch focus, would carry adistance of two miles and satisfactorilyilluminate a white buoy approximately.3 feet by 3… … 14B4 Fig. 3.—Standard 36-in. diameter liand-con-trolled projector, fitted with a Louvreflashing shutter operated by a lever from thehack of the projector for signalling purposes. The question of specifjdng the powerof a Projector in candlepower is verymisleading and really meaningless,although…
Lighting
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