Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 93
Fig. 1.—Distribution of light from bare mantle(consuming one-ninetieth gallon of petrolper hour). Intensity immediately undermantle 9() C.P. (approx.). from that derived from coal gas. Thelight yielded by a petrol gas mantleshould be almost exactly similar tothat obtainable with high-pressure gas … Fig. 2.—Distribution of light from burner (con-suming one-ninetieth gallon of pptrol i)erhour), equipped with opal shade. Intensityimmediately under mantle, 210 C.P. (njiprox.). lighting, since the temperature is sub-stantially the same; it has, however,undoubtedly less green in its com-position…
Lighting
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