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Updated: May 9, 2025
We called him "Flagstaff," and cracked all sorts of jokes about putting an insulator on his head, and setting him up for a telegraph pole, braiding his legs and using him for a whip lash, letting his hair grow a little longer, and trading him off to the Rebels for a sponge and staff for the artillery, etc.
In 1846, he was made a member of a commission organised in Berlin to introduce electric telegraphs in place of the optical ones hitherto employed in Prussia, and he succeeded in getting the commission to adopt underground telegraph lines. For the insulation of the wires he recommended gutta-percha, which was then becoming known as an insulator.
Of course there was no convenient chimney on the barn to act as a support for the mast, but they finally rigged up a mast at one end of the barn, nailing it securely to the siding boards. Then they drew the copper wire through the hook in the insulator until there was just a little slack, cut off the wire, and wound it securely.
On the lower end is placed an outside conducting coating C, which connects to the wire w. The wire has a hook on the upper end for suspension, and passes through the centre of the inside tube, which is filled with some good and tightly packed insulator.
As we stood, half dazed by the suddenness of the turn of events, Kennedy hastily explained: "Tesla's theory is that under certain conditions the atmosphere, which is normally a high insulator; assumes conducting properties and so becomes capable of conveying any amount of electrical energy.
"We will devote one of them to experiment," said he, leaving the last standing upon the glass insulator. "To the world it would seem an expensive demonstration which cost two thousand pounds, but our standard, you see, is a different one. Now you will see me run through the whole gamut of metallic nature."
"Rubber is believed to be a pretty good insulator," chuckled Reade, as he finished. "I don't believe the spark is made that can jump three inches of rubber. Certainly magneto-power can't do it. Now, let me see what sort of a trail-concealer I am." Tom laid the wire back in the ground, covering it carefully with his hands.
The ground lay level and open to the sun, with nothing to prevent its thawing except this peculiar blanket of tundra mosses, vines, and plants, which formed an insulator as perfect as if made to order. It was now the middle of June. There was no doubt but that the ice would remain as it was all summer. "Giant powder might possibly be used, but it was dangerous and expensive.
He constructed two instruments of the foregoing description, equal in size and similar in form. The interior sphere of each communicated with the external air by a brass stem ending in a knob. The apparatus was virtually a Leyden jar, the two coatings of which were the two spheres, with a thick and variable insulator between them.
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.
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