Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 213
s being altered by the chiefly to means for remedying or obviat- vibrations of the voice. In Reis's trans- ing these defects. Prof. Thompson pro- mitter, in Edison's, and in other well- poses to employ mirrors, sound-reflectors or reverberators (one form of which is known forms of this instrument,… … metal or silvered with a tympanum or diaphragm, and r —~ i those in which the current-regulator is glass are employed acted upon directly by the air-waves of for this purpose, they have the addi- tional advantage of revealing to the the voice — the improvements relate to the latter only, as Prof.…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
