Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 551
t at the openingmeeting of the American IlluminatingEngineering Society on September 23rd,Prof. G. A. Hoadley, on behalf of thePhiladelphia section, presented to theSociety an interesting chairmans gavelof unique composition and designed to made in Welsbachs laboratory in 1887 ;and the arc lamp by… … Ftg. ].—Diagram showing constitution of Gavel.
Lighting
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