Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 411
I Fia. 3.—Sliow-ruoiu with semi-indirect gas light fittings installed. 396 THE ILLUxMlNATING ENGINEER. Luminous Airship Signals. A RECENT article in the DeutscheLuftfahrer ZeitschriH gives an interest-ing account of a new form of luminoussignals for airships. Germany in1909 was the first countrj^… … Fig. 1.—Letter outlined in Holophane units,serving as an indication to aviator.s. their whereabouts to airships by cer-tain letters, marked out in brightpoints on convenient buildings, andof sufficient size to be seen even byaviators at a considerable height.Silvered glass spheres have some-times…
Lighting
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