Electrical appliances of the present day; being a report on the Paris Electrical Exhibition of 1881 (1884)
Heap, D. P. (David Porter), b. 1843 · New York, D. Van Nostrand · leaf 229
226 When it is desired to apply the principle to a reflecting apparatus, it roav be constructed as shown in big^« 212 01 213, tin* lath i being the best, as it embraces a larger angle for the same amount of material. … In the collectors, the conic surfaces are made of plates of 'ilver-phtel metal mounted on a light frame. In reflectors, in order to gain strength, Fig. 214.
International Electrical Congress, Paris, 1881
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