Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 161
Fig. 13.—Holophane Bowl Refractor.Polar curves showing light distribution from flat ring filament gas-filled lamp andzig-zag filament gas-filled lamp. 150 THE ILLUMINATING ENGINEER (june 1919) Tapped 3^4.Gas Adjusting Screw-Locking All PorcelainGoliath Holder I. Cap … Gravity Catch 2 Piece HolophajieBand Refractor Ventilation y Fig. 14.—Section drawing of modern type street lantern for gas-filled lamps.
Lighting
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