What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
aerial wire alternating current antenna apparatus armature arrangement capacity cell centimetres charged coherer condenser circuit conductor connected consisting copper wire coupled curve cymometer cymoscope damping detector diameter dielectric constant dielectric strength direction disc discharge distance ebonite effect electric force electric oscillations Electrician electromagnetic electromotive force electrostatic employed energy equal equation feet formula galvanometer given glass helix Hence Hertz Hertzian high frequency high frequency currents hysteresis Improvements induction coil insulated iron Leyden jar logarithmic decrement loop magnetic force Marconi maximum value measured mercury metal method node obtained ohms oscillation circuit oscillation transformer oscillatory circuit patent period placed platinum Poldhu potential difference primary circuit quantity radiation ratio receiving refractive index resonance secondary circuit shown shunt signals spark balls spark gap spark length spark resistance spiral surface syntonic Tele terminals transmitting tube vector velocity vertical voltage volts wave length wireless telegraphy
Page 657 - 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...
Page 424 - ... simpler and more certain means of generating electrical rays of any desired wave-length, from the shortest, say of a few feet in length, which will easily pass through buildings and fogs, to those long waves, whose lengths are measured by tens, hundreds, and thousands of miles; secondly, more delicate receivers, which will respond to wave-lengths between certain defined limits, and be silent to all others ; thirdly, means of darting the sheaf of rays in any desired direction...
Page 424 - Rays of light will not pierce through a wall, nor, as we know only too well, through a London fog. But the electrical vibrations of a yard or more in wave-length of which I have spoken will easily pierce such mediums, which to them will be transparent. Here, then, is revealed the bewildering possibility of telegraphy without wires, posts, cables, or any of our present costly appliances.
Page 176 - 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.
Page 425 - This is no mere dream of a visionary philosopher. All the requisites needed to bring it within 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 to those of sober fact.5 If Crookes...
Page 18 - The discharge, whatever may be its nature, is not correctly represented (employing for simplicity the theory of Franklin) by the single transfer of an imponderable fluid from one side of the jar to the other; the phenomena require us to admit 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.
Page 657 - 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...
Page 430 - 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.
Page 431 - He has not discovered any new rays ; his transmitter is comparatively old ; his receiver is based on Branly's coherer. Columbus did not invent the egg, but he showed how to make it stand on its end, and Marconi has produced from known means a new electric eye, more delicate than any known electrical instrument, and a new system of telegraphy that will reach places hitherto inaccessible.
Page 658 - 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.