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apparatus armature articulate Aschaffenburg auditory nerve battery Bell's British Patent centimetres closing the circuit coil combination of tones conductors constructed contact-pieces corresponding curved lever degree of contact demagnetised described Edison Eeis's instruments Eeis's Telephone elastic electric current electric resistance electro-magnet Elisha Gray exhibited experiments fixed musical Frankfort Frankfort-on-the-Main Free German Institute Friedrichsdorf galvanic current Garnier's Institute Giessen given Herr Hochstift Horkheimer human ear human voice interruptions interruptor inventor iron knitting-needle lamp-black lecture Legat Legat's Eeport magnet magnetised membrane memoir ment metal mitter motion needle opening and closing Philipp Eeis phonautograph Physical Society plate platinum strip principle produced Prof Professor Bottger Prospectus rarefaction receiver Reis Reis's reproduced reproduction of tones resistance singing sound sound-waves sounding-board speaking spiral spring steel strip of platinum telegraph tion trans transmit speech tube tympanum undulations undulatory currents varying vibrations voice vowels wire words Yeates
Page 172 - A+B also indicates the actual motion of the air when the two musical notes considered are sounded simultaneously. Thus, when electrical undulations of different rates are simultaneously...
Page 178 - The method of, and apparatus for, transmitting vocal or other sounds telegraphically, as herein described, by causing electrical undulations, similar in form to the vibrations of the air accompanying the said vocal or other sounds, substantially as set forth.
Page 85 - In his own prospectus, which was published in 1865 and attached to the apparatus, he says : " Every apparatus consists . . . of two parts, the telephone proper and the receiver. . . . These two parts are placed at such a distance from each other that singing or toning of a musical instrument can be heard in no other way from one station to the other except through the apparatus.
Page 175 - A, is used to converge sound- vibrations upon the membrane. When a sound is uttered in the cone the membrane a is set in vibration, the armature c is forced to partake of the motion, and thus electrical undulations are created upon the circuit E b efg. These undulations are similar in form to the air vibrations caused by the sound — that is, they are represented graphically by similar curves.
Page 176 - ... of any given motion by subjecting said armature to an attraction varying in intensity, however such variation may be produced in the magnet ; and hence I claim the production of any given sound or sounds from the armature of the receiving-instrument...
Page 171 - Electrical un-dulations induced by the vibration of a body capable of inductive action can be represented graphically - without error - by the same sinu-soidal curve which expresses the vibration of the inducing body itself, and the effect of its vibration upon the air; for , as above stated, the rate of oscilla-tion in the electrical current corresponds to the rate of vibration of the inducing body - that is to the pitch of the...
Page 55 - Rcis's early forms of Telephone. "Taking my stand on the preceding principles, I have succeeded in constructing an apparatus by means of which I am in a position to reproduce the tones of divers instruments, yes, and even to a certain degree the human voice.
Page iii - Inventor of the Telephone: A Biographical Sketch. With Documentary Testimony, Translations of the Original Papers of the Inventor, &c. By SILVANUS P.
Page 5 - I attacked a work begun much earlier concerning the organs of hearing, and soon had the joy to see my pains rewarded with success, since I succeeded in inventing an apparatus by which it is possible to make 1 Guillemin, "Le Monde Physique,