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i. WII18PER HEARD 143 MII.ESOFK.8!Prof. Bell, the iovsotor of the telephone, cobk'I from the staid old city of the witches —Salem. Be ia professor of vocal physio logy r in the BoatoD Univeisity. Aboat five yeara ago he tlrat began te think about the possibility of the tranamiaalon of sound by telegraph, and the idea took possession of hitu completely. Hia invention had bo far takeu form eighteen uiontha ago, that with the assistance of a prncttcnl electrician, Ur. Wataou, he began tn experiment.The liret time the practical succesa of the telephone was demonstrated to the satisfaction of others was on Oct. i, 16/6, when an experiment was mado over the private wire of the Walworth Manufacturing Company of Cambridge rnnniDg to Boston, two in ilea distant. The telephone then spoke for itself, and the conversation of the operator in Cambridge could be distinctly heard at the Boston end of the line.An interesting dialogue took place, the sneaker* talking in their ordinary key.tine of the experiments, which occurred oa Jan. 1 oq a wire mooing from Boston to Balsui, was eminently gratifying io iip results. Not only every word spoken in Boston, but even thetouea and inflexions of the several voices wereaccnrately transmit red and readily recoguizcd by those at the Salem end of the line. Other experiments demonstrated the fact that a lady in Mal-deu could sing The Last Rose of Summer,” and every note be heard in^he room at Boston. The sonnd was perfectly clear, and had about the same effect as if the listener were at the rear of a concert hall, aay 100 feet away from the singer. Subsequent trials showed that laughter, applause or . instrumental music could be equally well p; transmitted. In the case of the latter, not slt; only the key coaid be transmitted but also the quality of the music. A violin could bo distinguished from the violoncello.The greatest diataace that has been vanquished by the Telephone is 143 miles— from Boston to North Conway N. II. The usual recent improvements made on the instrument do away with batteries uitogelh er, and permanent magnets are now employed instead, the electric wave used in transmitting the sounds being generated by the voice itself. This ia regarded as a very important step in advance, aa the bother and expense of keeping batteries in order has beeu the great drawback to tho employ meut of tho instrument for private purposes.The wonderful little instrument of whose future valuo to civilization the iiivonior in sanguioe, consists of a powerful compound permanent magnet, to the poles of which are attached ordinary telegraph coils of iosulatud wire. In front of the poles surrounded by these coils of wire, is a diaphragm of iron. A mouthpiece, whose function is to converge the sound upon this diupbram, substantially completes the arrangement. The operation of the instrument is thus described by Prof. Bell : The motion of steel or iron tu front of the poles of a magnet creates a current of electricity in coils surrounding the polcaof the rung net, and the duration ol thn current of electricity coincides with the duration of the motion «-f the steel or iron moved or vibrated in the proximity of the magnet, When the human voice causes the diaphragm to vibrate, electrical undulation* are induced in the colls around the magnets precisely similar to tho undulations of the air produced by the voice. Tho coils are conuecicd with the line wire, and the undulations induced in them travel through tho wire, and passing through the coils of another instrument or aimilar canatrnctio i at the other end of the line are again re solved into air undulations by the diaphragm of this instrument. Tlie voltaic battery is entirely dispensed with. The liue wire may be or any given length, provided the insultation be good. Prof. Bell further says that soft toues can be heard across the wires even mom distinctly than loud utter ances, even a whisper being audible.stniarthti«K*p*p’-tilt;w:ticbythatnifoLtlistencmcainin.., i. .. i.. .iatto'inItanehanpetoihanup to Idu sh pe a f rei mlt; tie do silHi
Newspaper Details
The Morning Star And Catholic Messenger
New Orleans, Louisiana, US
Sun, Mar 11, 1877
Page 6
Full Page
Clipped by
Anonymous
NY, USA 30 Mar 2022
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