Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 193
were fittedthirty-nine silvered mirror reflectors,each set at a slightly different angle.The rays from the source of light, passingthrough the dioptric lens, were caughtby the reflectors and then reflectedin a cone to the converting point, 3 to3£ feet below the lamp—which in this 176 THE… … L)|ht tbouf , 39 in t •W» ublc \ Sectional Elevation. candlepower. As would be understood,if the surgeon was leaning over theoperating table during an operation, acertain amount of light did not reachthe table, but the rays that did do soovercame the shadows cast by thehead and shoulders of the…
Lighting
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