Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 552
of lenses may be adduced thelaryngoscope, which is an instrument invented to facilitate the investigation 534 On Lio-ht. [563- of the larynx and the other cavities of the mouth. It consists of a plano-convex lens L, and a concave reflector M, both fixed to a ring which can beadjusted to any… … Fig. 516. the lens is changed after emerging into a parallel pencil. Moreover, thepencil from the lamp, impinging upon the mirror, is reflected to the focus otthe lens, and traverses the lens, forming a second parallel pencil which issuperposed on the first. This being directed into the mouth of a…
Physics
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-337-227.webp)
