. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. 1191. having a flexible speaking tube communicating with the diaphragm, and binding screws for theconnecting wires. The call of the Gower telephone consists of a harmonium or concertina reed, Figs. 1190, 1191,fixed to the under side of the diaphragm M, opposite a narrow slit in the latter. Air sent throughthe speaking tube passes through this aperture in the diaphragm, and agitates the reed, whichsounds like a miniature trumpet or horn, and being placed within the magnetic field transmits itsnote over the
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. 1191. having a flexible speaking tube communicating with the diaphragm, and binding screws for theconnecting wires. The call of the Gower telephone consists of a harmonium or concertina reed, Figs. 1190, 1191,fixed to the under side of the diaphragm M, opposite a narrow slit in the latter. Air sent throughthe speaking tube passes through this aperture in the diaphragm, and agitates the reed, whichsounds like a miniature trumpet or horn, and being placed within the magnetic field transmits itsnote over the telephone wire to the distant station, where it can be distinctly heard. Fig. 1190shows the position the call occupies in the instrument. 584 ELECTRICAL Fig. 1192 is of the Ader telephone. An iron wire, or strongly magnetized needle M is solderedat each end to a mass of copper E and D, and surrounded by a bobbin or coil of insulated copper mass D is soldered to a larger mass of lead C, which is perforated longitudinally at O O,to allow the ends of the coil to be brought to the binding screws at F, by which the telephone isconnected in circuit. The metal mass D C must be phonetically insulated from the mass E, toprevent confusion of vibrations, con-sequently D C is encased in a sheetof indiarubber H. The ear-piece Ais fitted to the instrument, and onlistening, while the vibratory cur-rents flow in the coil, the soundsare audible. The general form of T. A. Edi-sons first telephone somewhat re-sembles the hand-telephone of Bell,although all analogy ends at thispoint. Through the middle of thebody of the case passes a stem,terminating at its upper extremity in a shallow cylindrical box or cup; this stem can be raised orlowered by
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
