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Updated: June 6, 2025
To preserve as low a temperature as the circumstances and climate will permit, the iron shell was lined with a non-conducting material, as slate or wood, leaving an annular interstice, through which a constant ventilation is effected, so as to carry off the excessive heat. To preserve the two lower tiers from rusting, they are coated with coal-tar. The tower itself is painted white.
Heating might now be accomplished without dust and ashes, without the destructive effects of steam, if enough houses would take electricity to enable a company to supply it in the form of a sort of dado carrying wires safely embedded in a non-conducting substance, or in the form of a carpet threaded with conducting wire.
The gray fibers occur chiefly in branches from the sympathetic ganglia, though found to some extent in the nerves of the cerebro-spinal system. In a general way, the nerve fibers resemble an electric cable wire with its central rod of copper, and its outer non-conducting layer of silk or gutta percha.
Their methods are as reasonable as to try to pour some precious stuff from the spring to the reservoir through a non-conducting pipe, which could by the least effort be opened. Professor Murray made several profound remarks to his white tie and to the water-carafe upon the table, with a humorous, twinkling aside to the silver candlestick upon his right. Then he sat down, and Mr.
Once arrived at the summit of Stony Hill, the wire supported on poles for a distance of two miles met a powerful pile of Bunsen passing through a non-conducting apparatus. It would, therefore, be enough to press with the finger the knob of the apparatus for the electric current to be at once established, and to set fire to the 400,000 lbs. of gun-cotton.
It needs scarcely be here remarked that in the Leyden jar, electricity can be accumulated and retained in considerable quantity, by the contrivance of having two conducting surfaces of equal extent, and parallel to each other through the whole of that extent, with a non-conducting substance such as glass between them.
These were a good deal like those worn by divers, except that the outer layer was made of non-conducting aluminum cloth, flexible, air-tight, and strong. Between it and the inner lining was a layer of cells, into which the men now pumped several pints of liquid oxygen.
We shall hereafter see what appear to be traces of an operation of this heat upon the surface of the earth in very remote times; an effect, however, which has long passed entirely away. The central heat has, for ages, reached a fixed point, at which it will probably remain for ever, as the non-conducting quality of the cool crust absolutely prevents it from suffering any diminution.
Up to this time facts had supported the theories of Davy and of Liedenbrock; until now particular conditions of non-conducting rocks, electricity and magnetism, had tempered the laws of nature, giving us only a moderately warm climate, for the theory of a central fire remained in my estimation the only one that was true and explicable.
It appears to me very extraordinary, that when this phial and nail are in contact with either conducting or non-conducting matter, the strong shock does not follow. I have cemented it to wood, metal, glass, sealing-wax, etc., when I have electrified without any great effect. The human body, therefore, must contribute something to it.
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