It is true that the dioptric apparatus was perfected independently by Fresnel, who had also the satisfaction of being the first to put it into operation. [Please select]
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Dioptric: with a transversely divided ocellus. [Please select]
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The dioptric system, in which the rays of light are transmitted through glass, has been introduced into the floating lights of India by the Messrs. [Please select]
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Since then, several more dioptric lights have been sent to the same region, and also to Japan in 1869, and all reports agree in describing these lights as being eminently successful. [Please select]
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