The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . nduce variations in the line current; their maKnitudowiU be proportional to the amplitude, and their frequency to thefrequency, of tae vmrations of the armature ; in fact, the differencebetweea the actual and the average current in the circuit will beat each instant proportional to the rate of motion of the foUows .rom this that the armature and membrane-of the dist
The Encyclopedia britannica; a dictionary of arts, sciences, and general literatureWith new maps, and original American articles by eminent writersWith American revisions and additions, bringing each volume up to date . nduce variations in the line current; their maKnitudowiU be proportional to the amplitude, and their frequency to thefrequency, of tae vmrations of the armature ; in fact, the differencebetweea the actual and the average current in the circuit will beat each instant proportional to the rate of motion of the foUows .rom this that the armature and membrane-of the distantinstrument should have induced in them a motion precisely similarto that of the membrane of the transmitter. This telephone wasmade m June 1875 but was put aside after trial as unsatisfactoryon account of the feebleness of the sounds it produced : since thenhowever, a successful telephone has been made on precisely thecame plan as that here indicated. _ The next fonn tried is shown in fig. 3. It is very similar exceptm constructive details to the first; the hinged armature, however,u omitted, its place being • - taken by a small iron disk A mfixed to the centre of the SitUaphragm D. The electro- ? 131 be^. J^^.l^Tf.* mteresting, not only bccansc they mayconsidered the first really sucoe^ful speaking telcnhonel but bc STIrfbvsTw Th ?^H ^ ^^ ^^^^^ o Grc?t ,/r^ ? ^.^°r°° ?* «*tibited before the British Asso-ciation at G-lasgow m that year. Fig 6 shows one of the earUest forms brought into commercial^^- 0° ^«ch pole of a somewhat large horse-sh^ pe^anenTmXl
Size: 1581px × 1581px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidencyclopedia, bookyear1892
