Elec. Eng., 1898, 2 7, p. 99) very successfully produced true parabolic reflectors for projectors, by depositing copper upon carefully ground and polished glass surfaces rendered conductive by a film of deposited silver. [Please select]
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The length of these reflectors can be determined by the angle of the lens when covering the picture. [Please select]
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The footlights should have reflectors behind them_, or a board about eighteen inches high with block-tin nailed on it. [Please select]
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------------------------------------------------------------------------ The floating lights of England are illuminated by means of lamps with metallic reflectors, on what is styled the catoptric system. [Please select]
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The rays may be assembled, however, by reflectors and lenses and so brought to bear in great force at a single point. [Please select]
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He suspected that the lighting and the crystal reflectors had not been arranged at random. [Please select]
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Let them lift their vast reflectors or refractors to the skies, and detect new planets in their hiding places. [Please select]
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