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Updated: June 15, 2025
Most of the critics form non-conductors to the passage of what has been regarded as analogous to an electrical current, and their non-conductivity is very little greater than that of many of the people who receive complimentary tickets or have the honour of being on the first-night list.
This surface admits of being polished as smooth as a coach-panel or a mirror. Unlike wood, it has no grain to be cracked or split, it never shrinks, and, paper being one of the best of non-conductors, no ordinary degree of heat or cold affects its shape or hardness, and hence these boats are admirably adapted for use in all climates.
The few loose leaves remaining will prevent the earth from sifting down between the heads, and the air chambers thus made answer a capital purpose in keeping out the cold, as air is one of the best non-conductors of heat. It is said that muck-soil, when well drained, is an excellent one to bury cabbage in, as its antiseptic properties preserve them from decay.
The walls of jails are good non-conductors of what goes on behind them, and this applies to other prisons as well as to that at Atlanta. Yet once in a while a groan or protest, or a partial account of some outbreak, finds its way through; and in many cases the gist of the story is to the effect that the food is bad or scanty.
It prevents, better than any other material, the loss of heat from the body, and allows free ventilation and evaporation. Its fibers are so lightly woven that they make innumerable meshes enclosing air, which is one of the best of non-conductors. Silk ranks next to wool in warmth and porosity. It is much softer and less irritating than flannel or merino, and is very useful for summer wear.
On the other hand, when there is a division or disintegration of atoms, such as exists in sawdust, powdered charcoal, furs, and felt, the particles composing such bodies are separated from each other by spaces of air, which the instructed among us well know are good non-conductors of heat.
"Naughty fellow!" murmured Madge. "But," continued Robin impressively, "if I fix little lumps of glass with a hole in them to the posts, and fix my wires to these, Electricity cannot bolt, because the glass lumps are non-conductors, and won't let him pass." "How good of them!" said Madge. "Yes, isn't it?
Oh, no! but what dull ache is this in that obscurely sensitive region, somewhere below the heart, where the nervous centre called the semilunar ganglion lies unconscious of itself until a great grief or a mastering anxiety reaches it through all the non-conductors which isolate it from ordinary impressions?
Gases, impalpable powders, and woolen stuffs, in common with other non-conductors of sound, give forth notes of different pitches when played upon by an intermittent beam of white light. Colored stuffs will sing in lights of different colors, but refuse to sing in others. The polarization of light being now accomplished, light and sound are known to be alike.
For the particles of these bodies, being non-conductors, do not impart heat to each other; and when the warmest are at the top, they can not take the place of cooler and heavier ones below. It is owing to this, that rough and black vessels boil water sooner than smooth and light-colored ones.
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