Rudimentary Electricity: being a concise exposition of the general principles of Electrical Science, and the purposes to which it has been appliedJ. Weale, 1848 - 160 páginas |
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Términos y frases comunes
agency of electricity appear attractive force axis become charged body charging rod coated glass coil common conducting connected copper cylinder disc disruptive discharge distance divergence ductor effect elec electrical action electrical charge electrical currents electrical discharge electrical excitation electrical forces electrical jar electrical machine electrical spark electrified electrometer electroscope excited electricity extremity Faraday feet friction hence inches in diameter induction instrument insulated conductor Leyden experiment Leyden jar light limiting conductors luminous magnet Marum metallic leaf motion needle negative conductor negative electricity neutral observed obtained operation opposite electrical outer coating particles phenomena phial placed polarized prime conductor produced quantity of electricity rectified spirit repellent repulsive force resinous electricity result rod of glass rubber sealing-wax shell lac silk similar square stratum substance surface suspended tension termed terminating thread trical tricity uninsulated varnished vitreous electricity Voltaic battery whilst wire wood zinc
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Página 120 - ... in a fluid insulating dielectric, as air, is very evident. It is at the extremity of the point that the intensity necessary to charge the air is first acquired (1374); it is from thence that the charged particle recedes; and the mechanical force which it impresses on the air to form a current is in every way favoured by the shape and position of the rod, of which the point forms the termination. At the same time, the point, having become the origin of an active mechanical force, does, by the...
Página 154 - In cases where metallic vane spindles, or other points, exist, the conductor may commence from these, and should be applied immediately to the part to be protected, and not at a distance from it ; and should be so applied that a discharge of lightning falling on the general mass could not possibly find its way to the ground through the building by any circuit of which the conductor did not form a part...
Página 138 - ... watch, or of a screw moving direct; currents in that direction round a needle would make it into such a magnet AS the dipping needle, or would themselves constitute an electro-magnet of similar qualities; or if brought near a magnet would tend to make it take that direction ; or would...
Página 146 - ... distance, and make a loud report, at how great a distance will ten thousand acres of electrified cloud strike, and give its fire; and how loud must be that crack!
Página 8 - It should, however, be here understood, that modern researches especially those of Faraday, lead us to conclude that there are no substances which perfectly conduct or perfectly obstruct electrical action. The insulating and conducting power is, in fact, a difference of degree only: still, the extreme differences are so great, that if classed in relation to such differences, those at the extremes of the series admit of being considered the one as insulators, the other as conductors; whilst the intermediate...
Página 123 - ... by catching in a mirror, whilst revolving on a horizontal axis at the rate of 800 times in a second, three electrical sparks produced by the discharge of an electrical jar in an interrupted circuit, the interruptions being at each end and in the middle of the conducting wire. In this experiment the centre spark fell out of the line of the other sparks by half a degree of the circle...
Página 153 - ... if circumstances permit, be connected with a spring of water, a drain, or some other conducting channel.
Página 119 - The spark is consequent upon a discharge or lowering of the polarized inductive state of many dielectric particles, by a particular action of a few of the particles occupying a very small and limited space ; all the previously polarized particles returning to their first or normal condition in the inverse order in which they left it, and uniting their powers meanwhile to produce, or rather to continue, the discharge effect in the place where the subversion of force first occurred.