Spon, Ernest, Haldane, Robert, Lock, Charles G. Warnford (Charles George Warnford), 1853-1909 · London ; New York : E. & F.N. Spon · leaf 174
s placed on a violin, blowing be used well without induction-coil, and lightly upon the strings produces reolian can be fixed to any of the existing ar- harp tones in the receiver, and a song rangements with switch and bell. The sung to the violin is rendered in the angle of microphone box is 10°… … small base-piece, and each supporting at more. Although carbon contact points its ui)per end a piece of ordinary bat- are preferable, they are not absolutely tery cnrbon. These 2 pieces of carbon essential to the operation of the instru- are placed in light contact, and the ment, as metallic points…
Workshop recipes · Technology · Industrial arts
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
