International Library of Technology · Scranton, International Textbook Co. · leaf 381
18 ELECTRIC LIGHTING. 13 … Fig. 10. from it. As the glass is thicker near the edges thanit is in the middle, the rays are there bent or refractedmore than they are at the center, and by making the mirrorof the proper dimensions it can be made to reflect the raysin a horizontal direction and give practically the same effectas…
Electrical engineering
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