Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 443
e, shownat B in Fig. 13. The cut sphere wasof substantially the same size as theprismatic one referred to above, butby comparison with the curve A of thebare lamp it is seen to have practicallyno redirective influence. In fact, ordinarycut glass has few merits apart fromappearances, and the same… … Fig. 15. -Polar Curve of Tungsten Lamp ancKBead Fringe. THE ILLUMINATING ENGINEER. 42f^ electric lamp globes having the shapesindicated to scale by the sketches. Theseare both made of crackled colom-less glasswith an iced surface. The effect of theinturned lip of the globe B is to redirectmuch of…
Lighting
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