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Updated: May 5, 2025
They had entered a large stone building, into which led numerous very heavy silver wires. The insulators were silicate glass. Their height suggested a voltage of well over one hundred thousand, and such heavy cables suggested a very heavy amperage, so that a tremendous load was expected.
The analogy then becomes quite close, and in the remaining rays the properties, so to speak, characteristic of the Hertzian waves, begin to appear. For these waves, as we have seen, the most transparent bodies are the most perfect electrical insulators; while bodies still slightly conducting are entirely opaque.
The operator said he had felt two shocks on August 13th one at five o'clock, which had shaken the books off his table and knocked over a box of insulators standing along a wall which ran north and south. He said the shock which I had felt was the lighter of the two. During the night it rained hard, but our tent was now adjusting itself to the "dry season" and we were more comfortable.
To-day the experimenter may buy wire, springs, insulators, batteries, and almost anything that might be useful. Morse, with scanty funds and limited time, had to search for his materials and puzzle out the way to make each part for himself with such crude tools as he had available. Need we wonder that his progress was slow?
From another point of view the nest of the Mantis is even more remarkable. It forms an excellent application of one of the most valuable lessons of physical science in the matter of the conservation of heat. The Mantis has outstripped humanity in her knowledge of thermic nonconductors or insulators.
However, strong arms at the bottom held it pretty steady, and Harry was enabled to nail on his insulators with comparative ease, and in a very satisfactory manner. After a while, Tony took his place, and being a fellow whom it was almost impossible to tire, he finished the whole business without assistance.
As for the conductors, which have their resting points upon ordinary insulators mounted at the top of the same supports, these are cables composed of copper and steel. They serve both for leading the current and carrying the tubes. The same arrangement was used by Messrs. Siemens and Halske at Vienna in 1883.
So, you see," continued Robin, "the glass lumps are insulators, for they cut the electricity off from the earth as an island is, or, at all events, appears to be, cut off from it by water; and Mister Electricity must go along the wires and do what I tell him.
Fitzgerald, of Dublin, has examined the question mathematically, and has shown that Maxwell's theory would have enabled Dr. Kerr's result to be predicted. Another requirement of the theory is that bodies which are transparent to light must be insulators or non-conductors of electricity, and that conductors of electricity are necessarily opaque to light.
Often did Czipra come upon the two men at their quiet pursuits and watch them for hours together; and though she did not understand what in this higher science went beyond her comprehension, yet she could take pleasure in observing Cartesius' diving imps; she dared to sit upon the insulators, and her joy was boundless when Lorand at such a time, approaching her with his finger, called forth electric sparks from her dress or hands.
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