Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 656
ing the hemispherical surface perpendicu-larly, passes straight through it, and is totally reflected at in by the inclinedsurface, and again at n, so that it returns to L by the path ti L. Reflectingglass prisms were also substituted for the metallic mirror, A B, b a, and thusthe use of metal has… … Fig. 306.—Stevensofis HolopJiotal Light. of illumination can yield. On the other hand, when a fixed light is dis-tributed to the whole horizon simultaneously, the illuminating power of thesource is taxed to the utmost. These two cases may be considered theextreme modes of disposing of the light,…
Inventions
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