Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 70
front. THE ILLOIINATDsG ENGINEER (feb.) as of sphero-paraboloid form, used iu con-junction with a 12-volt battery and half-watt lamps of 150 candle-power. This gives a parallel beam, as all ravsissuing from the source of light are eitherreflected or refracted into a concentrated like… … Fig. 2.—Aero-arc projector outfit, with small dynamo and automatic field-regulatiniiresistance. 2.000 candle-power. Weight only 60 lbs. iMr. A. LvoiO
Lighting
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
