Inventors at work, with chapters on discovery (1906)
Iles, George, 1852-1942 · New York, Doubleday, Page & company · leaf 118
Class A,Holophane globe, throw-ing rays mainly down-ward. Class B, rays mainly directed at an angle of 6o°. Class C,casting rays chiefly in alateral direction. BINOCULAR GLASSES 81 … Section of Holophane globe and Welsbach mantle. showing distribution of light. Each typical ray as refracted is marked by a letter of its own. In the Zeiss Works at Jena, in Germany, optical instrumentsof the highest excellence are manufactured; many of these takeadvantage of the principle of total…
Inventions · Inventors
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