The Electric Telephone (Google eBook)

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McGraw Publishing Company, 1902 - Telephone - 453 pages
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Page 146 - The simplest form of cell consists of a plate of zinc and a plate of copper immersed in a vessel of dilute sulphuric acid, with copper wires attached to the plates. When the wires are joined the 'circuit is completed...
Page iv - Company, 1896. 412 pages, 5}-* by 7 ; 143 illustrations ; price, i. Very modestly the authors state that they have prepared this little book on the telephone, in the hope of enabling those who are not trained in electro-technics to understand the main principles and method of operation of the telephone systems of today. But its scope is so comprehensive that every worker in the telephone field will find much of value interestingly presented in its pages, for it is an up-to-date presentation of...
Page 10 - ... note FIG. 7. sounded on the violin differs from the same note on the flute, because, although the fundamental of both may be the same in pitch and loudness, yet the overtones, or, as they are sometimes called, the harmonics, differ both in number and relative intensities. What is recognized by the ear as the pitch of such sounds is in reality the pitch of only one of these tones, that is, the fundamental, because it is usually the most prominent. This difference in the above two sounds is due...
Page 343 - As, however, the copper wires are increased in diameter, their effective cross-section becomes slightly reduced, owing to the fact that the electric flux, travelling along the surface, finds its entrance into the interior of the wire opposed by magnetic influence.
Page 8 - E, 36O, or a complete cycle. 13. Frequency. The number of complete cycles occurring in one second of time is called the frequency of the vibration. The term frequency is often misused by representing it as the number of half vibrations that occur in a second. 14. Period. The period of a vibration is the time that elapses during one complete cycle; thus, if P represent the period and the frequency, it is evident that P = -. It is the time required...
Page 178 - The magnet coils of these bells are wound with many turns of fine wire to a resistance of about 1,000 ohms.
Page iv - Since this preface was written much growth and development have taken place in telephonic engineering and practice. The authors have...
Page 41 - EMF in the circuit divided by the total resistance of the circuit in ohms, or Ohm's law may be expressed volts amperes = -r- . 1 ohms Thus, if the circuit shown in Fig.
Page 354 - Fig. 68, it will be seen that when a telephone is employed in conversation, the secondary winding of the induction coil is included in the line circuit.
Page 41 - Again, if a dynamo-electric generator produces at its terminals a pressure of 100 volts, and the resistance of an incandescent lamp...

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