Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 247
t. The bell serves as a mouthpiece ; that is, it receivesthe sound coming from the mouth of the person who speaks. These soundsare transmitted by a series of reflections to the interior of the trumpet, sothat the waves, which would become greatly diffused, are concentrated onthe ear, and produce a… … Fig. 229 Fig. 230 this instrument devised by Konig. Two sheets of india rubber, c and «, arefixed to the circular edge of a hollow metal hemisphere ; the edge is providedwith a stopcock, so that the sheets can be inflated, and then present theappearance of a double convex lens, as represented in…
Physics
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