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Gilbert and Charley returned from their ride; they had come on our tracks last night, but, surrounded as they were by rocky hills and gullies, had been compelled to encamp. We travelled about seven miles and a half, and crossed three good sized creeks, joining the Lynd from the north east. The river divided several times into anabranches, flowing round, and insulating rocky hills and ridges.
It consists, as shown in figure 8, of a metal plate B having an insulating handle of glass H, and a flat cake of resin or ebonite R. If the resin is laid on a table and briskly rubbed with cat's fur it becomes negatively electrified. The brass plate is then lifted by the handle and laid upon the cake. It touches the electrified surface at a few points, takes a minute charge from these by contact.
The globe L is blown out on the bottom into a very small bulb b, which serves to hold it firmly in a socket S of insulating material into which it is cemented.
"Mart, did you see what I saw, or did I get tight on something without knowing it? That sure burned me up it breaks me right off at the ankles, just to think of it!" Crane walked to the educator in silence. He examined it, felt the changed coils and transformers, and gently shook the new insulating base of the great power-tube.
He also invented a submarine telegraph cable, which he laid and operated with perfect success, in 1843, from Coney Island and Fire Island to the city of New York, and from the Merchants Exchange to the mouth of the harbor. His insulating material consisted of a combination of cotton yarn with asphaltum and beeswax; the whole was inclosed in a lead pipe.
The soldering, as well as the entire plates, is entirely immersed in the liquid, and to prevent any leakage an insulating varnish, perfectly proof against the acid and the current, is laid over the rod from the part soldered upward.
It perhaps symbolized a peculiar character in the relation of these two, insulating them, and building up an insuperable barrier between their life-streams and other currents, which might seem to flow in close vicinity.
Another way to combat this upward radiation is to pour a loose, featherlike insulating material into the space between the attic flooring and the plaster of the bedroom ceilings.
This will no doubt be partly accomplished by the electrolytic producers of copper when once they get properly started on methods of depositing thin strips or wires of tough copper on to sheets of insulating material for wrapping round the magnets and other effective parts intended for dynamos.
The paper and tin-foil are then pressed together and impregnated with an insulating compound. A fixed condenser of the exact capacitance required for connecting across the head phones is mounted in a base fitted with binding posts, as shown at B, and costs 75 cents.
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