Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 5, 2025
This is apparently due to induction caused by the snow accumulating on the insulators aloft, and thus rendering them useless, and probably to increased inductive force of the current in a body of snowdrift. He thinks that the proximity of the Magnetic Pole and Aurora Australis might affect things. The radiation is good and sufficient for normal conditions.
Its top would be at least sixty feet above the cabin, so he could talk over twenty-five miles. He had brought with him four hundred feet of copper bell-wire and a dozen or so cleat insulators. He cut two spruce spreaders, and strung his antennæ.
This he borrowed, and brought over to the scene of operation. This ladder was not quite long enough to reach to the height at which Harry had fastened his insulators, but it was generally agreed that there was no real necessity for putting them up so high. The ladder was arranged by Tony in a very ingenious way. He laid it on the ground, with the top at the root of the tree to be climbed.
The Phoenix began to uncoil the wire, while David gazed up doubtfully at the shadowy maze of lines and insulators on the cross-arms. "Electricity," said the Phoenix thoughtfully, "is a complicated and profound subject. There are amperes, and there are volts, and there are kilowatt hours. I might also mention positive and negative and ah all that sort of thing. Most profound.
Graham Bell in the last few months have shown that even ebonite, one of the most opaque insulators to ordinary vision, is certainly transparent to some kinds of radiation, and transparent to no small degree.
As the railway had been made, the telegraph-wire had, of course, followed it. Every consignment of rails and sleepers had been accompanied by its proportion of telegraph-poles, insulators, and wire.
We will consider this first, as its design must govern, within certain limits, the design of the locomotive. There are three systems of electrical transmission available. The trolley system, with overhead cable attached to insulators on posts, to carry the current one way, the rails being used as the "return."
A far better aerial, because it is more highly insulated, can be made by using midget insulators instead of the porcelain insulators described under the caption of A Single Wire Aerial and using a small electrose leading-in insulator instead of the porcelain bushing. This makes a good sending aerial for small sets as well as a good receiving aerial. The Best Aerial that Can Be Made.
Water, on the other hand, is a partial conductor, and a great enemy to the storage or conveyance of electricity, from its habit of soaking into porous metals, or depositing in a film of dew on the cold surfaces of insulators such as glass, porcelain, or ebonite. The remedy is to exclude it, or keep the insulators warm and dry, or coat them with shellac varnish, wax, or paraffin.
We shall admire its ingenious adaptation to the need of a district that is buried half the year in snow, the hard bed below, curved and guttered to do its own clearing, the great arched sleeper masses, raising the rails a good two yards above the ground, the easy, simple standards and insulators. Then it will creep in upon our minds, "But, by Jove! This is designed!"
Word Of The Day
Others Looking