The Principles of Electric Wave TelegraphyLongmans, Green, and Company, 1906 - 671 páginas |
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Termos e frases comuns
aerial wire æther alternating current antenna apparatus applied armature arrangement capacity cell centimetres charge closed coherer condenser circuit conductor connected consisting copper wire coupled curve cymometer cymoscope damping detector diameter dielectric constant dielectric strength disc discharge distance ebonite effect electric force electric oscillations electric strain Electrician electromagnetic electromotive force electrostatic employed energy equal equation formula galvanometer glass harmonic helix Hence Hertz high frequency high frequency currents induction coil insulated iron J. J. Thomson Leyden jar logarithmic decrement loop magnetic force Marconi maximum value measured metal method node ohms oscillation circuit oscillation transformer oscillatory circuit patent period placed platinum potential difference primary circuit quantity radiation ratio receiving refractive index resonator secondary circuit shown signals spark balls spark gap spark length spark resistance specification spiral station surface syntonic temperature terminals trains transmitting tube vector velocity volts wave length wireless telegraphy
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Página 633 - If a justice of the peace is satisfied by information on oath that there is reasonable ground for suspecting that an offence under this Act...
Página 16 - ... the existence of a principal discharge in one direction, and then several reflex actions backward and forward, each more feeble than the preceding, until the equilibrium is obtained.
Página 419 - All the requisites needed to bring it within the grasp of daily life are well within the possibilities of discovery, and are so reasonable and so clearly in the path of researches which are now being actively prosecuted in every capital of Europe that we may any day expect to hear that they have emerged from the realms of speculation into those of sober fact.
Página 634 - radio communication" as used in this Act means any system of electrical communication by telegraphy or telephony without the aid of any wire connecting the points from and at which the radiograms, signals, or other communications are sent or received.
Página 418 - Here, then is revealed the bewildering possibility of telegraphy without wires, posts, cables or any of our present costly appliances.
Página 633 - Order, he shall be liable on summary conviction to a fine not exceeding one hundred pounds or to imprisonment with or without hard labour for a term not exceeding six months, and...
Página 424 - He has invented a new relay which, for sensitiveness and delicacy, exceeds all known electric apparatus. The peculiarity of Mr. Marconi's system is that, apart from the ordinary connecting wires of the apparatus, conductors of very moderate length only are needed, and even these can be dispensed with if reflectors are used.
Página 173 - Standard deviation is a measure of dispersion in a frequency distribution equal to the square root of the mean of the squares of the deviations from the arithmetic mean of the distribution.
Página 634 - Where the applicant for a licence proves to the satisfaction of the Postmaster-General that the sole object of obtaining the licence is to enable him to conduct experiments in wireless telegraphy, a licence for that purpose shall be granted, subject to such special terms, conditions, and restrictions as the Postmaster-General may think proper, but shall not be subject to any rent or royalty.