Light, photometry and illumination : a thoroughly revedof ''Electrical illuminating engineering'' . asthe test lamp, or by removing the intercepting screen and themirrors and obtaining the constant of the apparatus by com-paring
Science for beginners . Fig. 52.—A reflex or inverted gas mantlelamp with prismatic glass reflector. Fig. 53.—The distributioncurve for the lamp. dence lighting is wasted. Light is wasted unless it is used
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