Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 54
tems. It employsa glass dish or hemisphere which makesa division of the light between theupper and lower hemispheres, giving a THE ILLUMINATING ENGINEER (FEB. 1919) 43 direct component of light downwardsand an indirect component of lightreflected from the ceiling or an over-reflector. (Examples:…
Lighting
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