Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 439
lobe in the right-handupper quadrant is due to the fact that themaximum luminous surface on the closedside of the reflector is seen from the regionindicated by the arrow. The polar curveof a reflector of similar character forelectric lamps is shown in Fig. 5. Thisreflector has a practically… … Fig. 8.—Increase in Candle-power of Inverted Mantle by Employment of Globe.(A = Bare mantle. B = Mantle with clear glassspherical globe.) THE ILLUMINATING ENGINEER. 60 SO -40 JO 2010 o lo ao 30 -*o so 60 425
Lighting
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