In other words, if light is an electro-magnetic disturbance, all conducting substances must be opaque, and all good insulators transparent.

Even such apparent exceptions as vulcanite, an excellent insulator, fall into the law, since, as Graham Bell has recently shown, this substance is remarkably transparent to certain kinds of radiant energy.

This leakage occurs both between the line conductors and at the insulators placed on the pole lines forming the line circuit.

The insulators are made either of glass or porcelain, and are of a peculiar form known as triple petticoat pattern.

The loss on such lines, due to leakage between wires, is greater than that which takes place at the pole insulators, and is diminished by keeping the circuit wires as far apart as possible.

The instrument is now in excellent order, and the photographic registers have been perfectly satisfactory since 1879, February, when the new insulators were applied.

She knew nothing of books, this quaint old woman, and had a very antiquated taste in wall-papers; yet there would seem to be other ways of being wise, and it may indeed be held that books act too much as insulators between us and the earth, to the mysterious currents of which gnarled shapes of unlettered old men and women may be the more sensitive as lying closer to the Mother.

"At the end of a week Professor Morse returned from New York and came to the shop where I was at work, and said he wanted to provide the insulators for putting the wires on the poles upon the plan I had suggested; to which I responded: 'How is that, Professor; I thought you had decided to use Mr. Vail's plan?'

In fact Morse used often to say that some people thought he had no right to claim his invention because he had not discovered electricity, nor the copper from which his wires were made, nor the brass of his instruments, nor the glass of his insulators.

"A cracked insulator, I think," said the Judge.

The two grooved tubes are suspended from insulators fixed upon external cast iron supports.

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.

by ½ in., and is held vertically by means of studs riveted into the side; these studs pass through porcelain insulators, and by means of wooden clamps and wedges are held in the iron chairs which rest upon the sleepers.

These were in and under the big white china insulators on the telegraph-poles.

The aërial, of four wires, each thirty feet long and parallel, were attached equi-distant, and at each end to springy pieces of ash ten feet long, these being insulators in part and sustained by spiral spring cables, each divided by a glass insulator block, the extended cables being fastened to a maple tree and the house chimney.

The aërial, of four wires, each thirty feet long and parallel, were attached equi-distant, and at each end to springy pieces of ash ten feet long, these being insulators in part and sustained by spiral spring cables, each divided by a glass insulator block, the extended cables being fastened to a maple tree and the house chimney.

Distinctions may be insulators in logic as much as they like, but in life distinct things can and do commune together every moment.

One of these, the Clara Bell, loaded with brackets and insulators, had already arrived; and the other two, with commissary stores, wire, instruments, and men, were en route.

The Clara Bell, in addition to her cargo of brackets and insulators, brought a foreman and three or four men as passengers, and these Major Abaza determined to send under command of Lieutenant Arnold to Yamsk, with orders to hire as many native labourers as possible and begin at once the work of cutting poles and preparing station-houses.

As soon as possible after the departure of the Varag, the Clara Bell was brought into the mouth of the river, her cargo of brackets and insulators discharged, Lieutenant Arnold and party sent on board, and with the next high tide, August 26th, she sailed for Yamsk and San Francisco, leaving no one at Gizhiga but the original Kamchatkan party, Dodd, the Major, and myself.

Left as we were at the beginning of a second winter without men, tools, or materials of any kind, except 50,000 insulators and brackets, we could do nothing toward the construction of the line, and our only resource was to make our unpleasant situation known to the Company.

We sold glass insulators by the hundred as patent American teacups, and brackets by the thousand as prepared American kindling-wood.

The market at last refused to absorb any more brackets and pickaxes; telegraph wire did not make as good fish-nets and dog-harnesses as some of our salesmen confidently predicted that it would; and lime-juice and water, as a beverage, even when drunk out of pressed-crystal insulators, beautifully tinted with green, did not seem to commend itself to the aboriginal mind.

I expected to have to return to the United States through Siberia, and I did not propose to put myself in such a position that I should be compelled to defray my travelling expenses by peddling lime-juice, cucumber pickles, telegraph wire, dried apples, glass insulators, and baking-powder along the road.

To-day the experimenter may buy wire, springs, insulators, batteries, and almost anything that might be useful.