Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 264
fParis in the centre of which is mounted aconcentrated filament miniature lampsupported by a plaster of Paris standard.The standard is so located that when thereflector is placed over the photometerthis lamp falls in the same position withregard to the reflector as does the centreof the lamp… … Photometric Device for Comparing the Efficiencyof Reflector?. 254 THE ILLUMINATING EXGIXEER (sept. 1920) V irious Reflectors. RLM. Standard Dome. ShallowDome Bowl MetalReflector Opal Enam- ReflectorClear ReflectorClear Diffusing Silver Globewith ClearBulb. FrostedBowl. elledBowl. Lamp. Lamp. Cap.…
Lighting
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