Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 170
ransmitting messages from one story to another. The tubesemployed for this purpose are called speaking tubes. The methodof employing the speaking tube, is illustrated in Fig. 111. The Speaking Trumpet. 159. The Speaking Trumpet, as its name implies, isa conical tube employed to transmit the voice… … Fi<r. 112. By means of the speaking trumpet, the A-oice of the captain canbe heard above the noise of the winds and waves in a tempest.According to Father Kircher. Alexander the Great employed aspeaking trumpet in commanding his armies. The effect of the speaking trumpet has been explained by…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
