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Light and lighting (1908)
Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 62
^iv^ … Fir. Fig. 1.^—Diagram showing characteristic opticalproperties of parabolic reflecting surface. -Twin Searchlight, 24-inch diain. mirror.100 amjiercs.Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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