Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 494
e light is supplied by dry batteriesstrapped to the belt of the operator.The light rays converge slightly so thatthey are invisible excepting in a certainplane. By the use of code messages maybe transmitted quickly and silently to adistance between five and six miles. Thearrangement may also be… … and an electric lamp with a telescopemounted on its upper rim. A pushbutton on the handle provides for theflashing. 480 THE ILLUMINATING ENGINEER oct.) PRIVATE AND PUBLIC LIGHTING INWAR TIME. Ix oui last Dumber we referred toof the special lighting appliances used inwar, searchlights on land and…
Lighting
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