United States or Aruba ? Vote for the TOP Country of the Week !
The wires and the surrounding water act as a Leyden jar, and the retardation of the current predicted by Faraday manifests itself in every message sent by such cables. The meaning of Faraday in these memoirs on Induction and Conduction is, as I have said, by no means always clear; and the difficulty will be most felt by those who are best trained in ordinary theoretic conceptions.
We said that electricity-metals carried electricity, so light-metals would carry or conduct light. Now we know that there is no substance which is transparent to light, that will carry electricity by metallic conduction. I mean, of course, that there is no substance transparent to light, and at the same time capable of carrying electricity by electronic transmission.
When pith balls are brought near to either of the conductors, they become electrified with the opposite electricity to it; either receiving a share from the already electrified atmosphere by conduction, or acted upon by the direct inductive influence of the conductor itself: they are then attracted by the conductor to which they are in opposition; or, if withdrawn in their electrified state, they will be attracted by any other oppositely charged body.
Some of our oldest and most successful appliers of rods believe that at certain points there are natural electric currents, or at least readier conduction for them than at others. Yet these points can become known only by repeated disasters.
There appears to be a luminous layer of minute sparks under the foils, and there is a strong smell of ozone. In a dielectric which heats, there may be three kinds of conduction, viz., metallic, when an ordinary conductor is embedded in an insulator; disruptive, as probably occurs in the case of mica; and electrolytic, which might occur in glass.
In our own navy the conductors pass from the upper part of the mast over the side of the vessel. It is not, however, to advocate making the gas-and water-pipes the main lines of conduction that I have made these citations, but to remove in some degree the dread of "having the lightning come into the house." A better conductor would be the metal covering of the roof when such material is used.
In the ventricles, Lewis states, the Purkinje fibers act as the conducting agent, stimuli being conducted to all portions of the endocardium simultaneously at a rate of from 2,000 to 1,000 mm. per second. The ventricular muscle also aids in the conduction of the stimuli, but at a slower rate, 300 mm. per minute.
Preece finally decided that a combination of conduction and induction was the best means of wireless communication. He grounded the wire of his circuit at two points and raised it to a considerable height between these points. Preece's work was to put the theories of Professor Trowbridge to practical use and thus bring the final achievement a step nearer.
He said he never lost consciousness; but when at the hospital he seemed very deaf and stupid. He was discharged perfectly cured twenty weeks after the occurrence. The scientific explanation of this amazing escape from this most eccentric vagary of the electric fluid is given, the fact that the wet condition of the man's clothing increased its power of conduction, and in this way saved his life.
Fifteenth, the conduction of breeding operations along any desired line, with the opportunity of combining the principle of great numbers for selection with the comparison of all progeny from ancestry, a method that will bring results a hundred times more quickly than the efforts of the small breeder.
Word Of The Day