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The cost is a great drawback, but if we employ an oil as an insulator the distribution of electrical energy with something like 100,000 volts, and even more, become, at least with higher frequencies, so easy that they could be hardly called engineering feats.
The wire w, passing through the large tube to the outside of the bulb, should be well insulated with a glass tube, for instance and the space between ought to be filled out with some excellent insulator. Among many insulating powders I have tried, I have found that mica powder is the best to employ.
The making of rubber heels and soles is now a large industry; hose for watering and for vacuum and Westinghouse brakes is made in increasing quantities. The making of rubber tires for automobiles and carriages is an important industry. The enormous and increasing use of electricity requires much use of rubber as an insulator.
Let us follow out this notion; consider, he argues, the case of a non-conductor of electricity, such for example as shell-lac, with its molecules, and intermolecular spaces running through the mass. In its case space must be an insulator; for if it were a conductor it would resemble 'a fine metallic web, penetrating the lac in every direction.
Maiorana discovered that lead balls swimming on a pool of mercury lost a certain amount of weight. It was explained that the weight was lost due to a screening effect which the mercury produced on the lead balls. In other words, mercury acts as a sort of insulator against the earth's gravitational waves. For gravitation certainly is propagated the same as other forms of energy, i.e., in wave form.
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.
Next bore a hole through the frame of the window at a point nearest your receiving set and push a porcelain tube 5/8 inch in diameter and 5 or 6 inches long, through it. Connect a length of wire to the top post of the arrester or just above it to the wire, run this through the leading-in insulator and connect it to the slider of your tuning coil.
On the stone wall, or perched on a telegraph pole, close to the solitary insulator on the summit, the singer poured out his sweet little song, ending in his best moods in an exquisite trill that resembled the silver bell of the chewink. The family spent their time in the road or the meadow, the mother working hard to supply the hungry little mouths, which gave vent to queer whining cries.
"Why, it's some little patent of Billy's, a deep-petticoat, double- groove porcelain insulator, if that means anyone to anyone!" laughed Susan. "He's been raving about it for weeks! And he and Mr. Dean have to rush the patent, because they've been using these things for some time, and they have to patent them before they've been used a year, it seems!"
"Who was that?" he half whispered. "Johnson." "Oh, yes." He fumbled in his uniform; his gaze swept the moonlit deck. "Gregg take this." He handed me a small metal box. I stuffed it at once into my shirt. "An insulator," he added swiftly. "Snap is in his office. Take it to him, Gregg. Stay with him you'll have a measure of security and you can help him to make the photographs."
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