Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 69
ojected vertically or in anyplane. To guard against the droppingof ash from the crater of the arc, whenthe light is directed vertically downwards,a detachable glass is fitted behind thelens, so that any ash falls on the glassand no material damage is done. Heagreed that the optical effect… … Fig. 1.—Battery of four patent oxy-petrol projectors on tripods complete withtransport case for field service. {Mr. A. Lyon.) on a tripod for army field work (Fig. 1).The range was limited, but its portabilitywas an asset. Another was an aero-arcprojector of extra light weight constructedfor…
Lighting
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