Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 126
ch is a photograph taken with twomotor-car headlights which, together,over the main portion of the beam wereequivalent to 1,400 candles. In theobscured segment, however, this intensitywas reduced to 14 candles without any THE ILLUMINATING ENGINEER (april, 1920) 115 appreciable diminution in the… … Fig. 1. -Showing the principle of thequarter beam. three - An alternative arrangement is that bymeans of which the beam is confined, asfar as possible, below the horizontal.This may be done either by a successionof deep louvres in front of the lamp, asshown in Fig. 2 or preferably by an
Lighting
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