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Updated: May 8, 2025
All nature is in a conspiracy to take it wherever it can find it, and from everything which at the moment has more than some other has, or more than its share with reference to the air and the world, of the mysterious essence that is in varying quantities everywhere. Glass is the usual non-conductor in daily use. A glance at the telegraph poles will explain all that has just been said.
These compartments were between the outer and inner hulls of the lower part of the craft, and were designed to prevent the interior becoming heated in case the travelers found they had to pass close to fire. There were also vacuum chambers, and from these the air was exhausted, as of course every schoolboy knows a vacuum is a non-conductor of either heat or cold.
It is likely that there are many such masses of ice inclosed between the ash layers in the upper part of the mountain, where, owing to the height, the climate is very cold. This curious fact shows how perfect a non-conductor the ash beds of a volcano are to protect the frozen water from the heat of the rocks about the crater.
Always the same thin film of some emotional non-conductor between them; always that kind of habitual regard and family-interest, mingled with the deepest pity on one side and a sort of respect on the other, which never warmed into outward evidences of affection.
So that although the Spark will stick to his wires when insulated on telegraph-posts on land, he will bolt from them at once and take to flight the moment he gets under water. This difficulty was overcome by coating the wires with gutta-percha, which, being a non-conductor, imprisoned the Spark, and kept him, as it were, on the line.
Later on I realized my mistake because my French is a non-conductor of profanity. Gerome had a wife. In the Congo, where all wives are bought, the consort constitutes the husband's fortune, being cook, tiller of the ground, beast-of-burden and slave generally. I had no desire to incumber myself with this black Venus, so I made Gerome promise that he would not take her along.
It is safe to infer from this analogy that the felt covering of boilers should not only be of considerable thickness, but should be protected by an external jacketing of some sort; for, though felt is a good non-conductor, it is a powerful absorber and radiator, more especially when it has been allowed to contract soot and dust.
It is, of course, not necessary, when it is desired to produce the incandescence of a body inclosed in a bulb by means of these currents, that the body should be a conductor, for even a perfect non-conductor may be quite as readily heated.
In open space it would be warmed and lighted by the sun, and in the shadow of a planet, if need were, by coal-gas and electricity. In either case, to temper the extremes of heat or cold, the interior could be lined with a non-conductor.
"I knows it now, Perfessor," said Washington humbly. "Then I hope you'll remember it. That applies to all of you," he went on. "If ever you have occasion to touch any electrical machinery, don't do it with both hands at the same time, if there is danger of forming a connection. Always use rubber gloves, and you'll be in no danger. Rubber is a non-conductor. Remember, Washington."
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