Wireless Telegraphy and Wireless Telephony: An Elementary TreatiseMoffat, Yard, 1909 - 279 pagini |
Alte ediții - Afișează-le pe toate
Wireless telegraphy and wireless telephony: an elementary treatise Arthur Edwin Kennelly Vizualizare completă - 1910 |
Wireless Telegraphy and Wireless Telephony an Elementary Treatise Arthur Edwin Kennelly Vizualizare completă - 1913 |
Wireless Telegraphy and Wireless Telephony: An Elementary Treatise Arthur Edwin Kennelly Vizualizare completă - 1909 |
Termeni și expresii frecvente
adjusted alternating currents amplitude apparatus arc lamp carbon circuit clockwise coherer condenser conducting conductor connected cycles per second density diaphram direction discharge disk distance disturbance dynamo earth elec electric and magnetic electric charge electric current electric flux electric impulse electric oscillation electric resistance electrolytic electrolytic receiver electromagnetic waves electromotive force energy ether feeble frequency ground height hemispherical wave horizontal inch indicated in Fig induction coil insulated kilometers length light light-speed magnetic flux magnetic waves mast messages metallic meters micron miles Morse moving musical tone ordinary overtones parallel passing plane platinum pole produced radiation receiving antenna receiving telephone resistance resonance rod A B rod oscillator secondary sending antenna sending station ship signals simple single musical sound sound-waves spark speed surface tele tenna tion transmitter tric tube tuned vertical rod vibrations vibratory voltage voltaic cell wave-length wire wire telegraphy wireless telegraphy wireless telephony yards
Pasaje populare
Pagina 153 - ... in this country if the Morse alphabet had not already obtained such a strong foothold among operators. So far, it has been found impossible to get the operators to learn a new code. By comparing the Morse and the Continental codes, it will be seen that the figure 4 and the following fifteen letters a, b, d, e, g, h, i, k, m, n, s, t, u, v, and w are the same in both; but the numerals, except the figure 4, the punctuation marks, and the following eleven letters c, f, j, /, o, p, q, r, x, y, and...
Pagina 258 - Bell of improving the operation of his harmonic telegraph by causing the transmitting interrupters each to make and break the primary circuit of an induction coil, the secondary circuit of which could be placed in the main line by the depression of a key.
Pagina 167 - If the conduction increased gradually to a maximum through many kil jmeters of ascent, there would be loss of energy by reason of imperfect conduction and eddycurrents in the transitional layers, so that the benefit due to ultimate confinement of the waves within the rarified shells, might be more than lost by waste of energy in this partial conduction.
Pagina 92 - ... workers were quite aware that receiving antennas erected in the path of transmitted electric waves had set up in them to-and-fro currents, the energy of the currents being the energy of the moving fluxes set up by the passing waves. They understood also that the alternating currents in the antennas were capable of being built up, or successively increased in strength, by the impulses of succeeding waves, provided the receiving circuit was in resonance with the frequency of the incoming waves,...
Pagina 262 - It is only reasonable to expect, however, that the range of possible wireless telephony will be less than...
Pagina 256 - One method of controlling the amplitude of the high-frequency out-going waves, in accordance with lower frequency vocal sounds, employs a carbon transmitter in the main sending antenna path as indicated in Fig. FIG. 79.— Trans- 79- In this case, the antenna A'"" IVn'a M havin§- been adjusted into Branch.
Pagina 202 - It has been found that the atmospheric absorption of electromagnetic wave energy occurs more generally and more powerfully in the tropical zone than in the north temperate zone, presumably on account of the greater relative intensity of solar radiation upon the atmosphere in the tropics.