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The tube T was slipped into a socket containing a primary coil through which usually the discharges of Leyden jars were directed, and the rarefied gas in the small U tube was excited to strong luminosity by the high-tension currents induced in the coil C. When Leyden jar discharges were used to induce currents in the coil C, it was found necessary to pack the tube T tightly with insulating powder, as a discharge would occur frequently between the turns of the coil, especially when the primary was thick and the air gap, through which the jars discharged, large, and no little trouble was experienced in this way.
And that rank, again, it presented to us under one of its least happy aspects; as insulating a blooming young woman amidst the choir of her coevals, and surrounding her with dreadful solitude amidst a vast crowd of the young, the brave, the beautiful, and the accomplished. Meantime, as respected myself individually, I had reason to be grateful: every kindness and attention were shown to me.
They swept on through the frozen streets until they came to one huge building in the center. The doors of bronze had been closed, and through the windows they could see that the room had been piled high with some sort of insulating material, evidently used as a last-ditch attempt to keep out the freezing cold. "Shall we break in?" asked Arcot.
The success of his metallurgical enterprise no doubt reacted on his telegraphic business. The making and laying of the Malta to Alexandria cable gave rise to researches on the resistance and electrification of insulating materials under pressure, which formed the subject of a paper read before the British Association in 1863.
I think that in lightning discharges frequently wires or conducting objects are volatilized merely because air is present and that, were the conductor immersed in an insulating liquid, it would be safe, for then the energy would have to spend itself somewhere else.
There is no wood, insulating compound or other dielectric materials in large enough quantities to absorb the weak currents that flow between them, hence weaker sounds can be heard when this kind of a variometer is used. With it you can tune sharply to waves under 200 meters in length and up to and including wave lengths of 360 meters.
Underneath was a small heap of oil-soaked rags. "You remember what we saw at the House of Power?" said Nanna, significantly. Esmay examined the wire carefully. At the broken end the insulating fabric had been stripped off and the copper scraped clean and bright with a knife-blade.
There were a few symptoms of medical pretensions in the shape of some vials, and bottles of drugs, and colored liquids on the mantelpiece; a great attempt at a display of scientific apparatus began and ended with an insulating stool, and an old-fashioned “cylinder and cushion” electrical machine; a number of highly-colored prints of animals pasted on the wall, having evidently been scissored from the show-bill of a menagerie, had a look towards natural history, and a jar or two of acids suggested chemical researches.
To secure an accumulator against any leakage from plate, the solderings and the entire plates must be submerged in the liquid, so that nothing projects up out of the acidulated water except two strong rods for making contact. These rods are covered with an insulating varnish from their origin to above the point where they issue from the liquid.
The Variocoupler. A variocoupler consists of a primary coil wound on the outside of a tube of insulating material and to certain turns of this taps are connected so that you can fix the wave length which your aerial system is to receive from the shortest wave; i.e., 150 meters on up by steps to the longest wave, i.e., 600 meters, which is the range of most amateur variocouplers that are sold in the open market.
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