The Student's Text-book of ElectricityLockwood & Company, 1867 - 519 páginas |
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The Student's Text-book of Electricity Henry Minchin Noad,Sir William Henry Preece Vista completa - 1879 |
Términos y frases comunes
action apparatus appearance armature arranged attraction axis ball bismuth brass cable carbon cells centre charge chemical circuit coating coil communication conducting wire conductor connected copper copper wire cylinder deflection diamagnetic direction disc discharge distance earth effect elec electric current electrified electro-magnet electrode electrometer electromotive force electroscope equal experiments extremity Faraday feet fixed Fleeming Jenkin galvanometer glass gutta-percha helix hydrogen inch in diameter increased induction instrument insulated intensity iron wire length letter lever Leyden jar light machine mercury metallic miles motion moved needle negative electricity nitric acid observed obtained opposite oxygen paper particles pass pendulum piece placed platinum platinum wire polarity pole positive electrode produced quantity of electricity ratchet-wheel resistance round screw shown in Fig soft iron solution spark sulphate sulphuric acid surface suspended telegraph tension terminal tion tricity tube voltaic battery voltaic current wheel wire zinc zinc plate
Pasajes populares
Página 400 - But Moses' hands were heavy ; and they took a stone, and put it under him, and he sat thereon ; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side ; and his hands were steady until the going down of the sun.
Página 198 - Knowing, therefore, the proportion of resistances in two circuits producing the same effect, we are able immediately to infer that of the electro-motive forces. But, as it is difficult in many cases to determine the total resistance, consisting of the partial resistances of the rheomotor [or voltaic combination] itself, the galvanometer,- the rheostat, &c., I have recourse to the following simple process.
Página 293 - Tyndall accordingly concludes that " if the arrangement of the component particles of any body be such as to present different degrees of proximity in different directions, then the line of closest proximity, other circumstances being equal, will be that chosen by the respective forces for the exhibition of their greatest energy. If the mass be [para] magnetic, this line will stand axial; if diamagnetic, equatorial."2 1 Tyndall on Diamagnetism, p.
Página 206 - Solution of sulphate of potash was placed in contact with the negatively electrified point, pure water was placed in contact with the positively electrified point, and a weak solution of ammonia was made the middle link of the conducting chain ; so that no sulphuric acid could pass to the positive point in the distilled water, without passing through the solution of ammonia. The...
Página 162 - The contact theory," he urged, "assumes that a force which is able to overcome powerful resistance, as for instance that of the conductors, good or bad, through which the current passes, and that again of the electrolytic action where bodies are decomposed by it, can arise out of nothing ; that without any change in the acting matter, or the consumption of any generating force, a current...
Página 92 - In a quiescent state, it had the appearance of a circular cloud revolving on the water like an horizontal wheel, in various and irregular involutions, expanding itself gradually on the lee side, when suddenly a column of the blackest cinders, ashes, and stones, would shoot up in...
Página 300 - ... that line along which, if a transverse wire be moved in either direction, there is no tendency to the formation of an electric current in the wire, whilst if moved in any other direction there is such a tendency. The direction of these lines about and between ordinary magnets is easily represented in a general manner by the well known use of iron filings.
Página 31 - For though all the particles in the line of induction resist charge, and are associated in their actions so as to give a sum of resisting force, yet when any one is brought up to the overturning point, all must give way in the case of a spark between ball and ball.
Página 94 - ... The wind blew with great violence, momentarily changing its direction, as if it were sweeping round in short spirals: the rain which fell in torrents was also precipitated in curves, with short intervals of cessation. Amidst this thick shower, the waterspout was discovered, extending in a tapering form, from a dense stratum of cloud to within thirty feet of the water, where it was hid by the foam of the sea being whirled upwards by a tremendous gyration.
Página 84 - While the thunder-cloud is swelling and extending itself over a large tract of country, the lightning is seen to dart from one part of it to another, and often to illuminate its whole mass. When the cloud has acquired a sufficient extent, the lightning strikes between the cloud and the earth in two opposite places, the path of the lightning lying through the whole body of the cloud and its branches. The longer this lightning continues, the rarer...