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Because a jump-spark sets up periodic oscillations, that is, the oscillations are discontinuous, it cannot be used for wireless telephony. An electric arc or a vacuum tube sets up sustained oscillations, that is, oscillations which are continuous.

He had on a light tweed suit, and he was wearing a soft shirt of a light colour, with a stiff collar, and a small black bow tie. When Sir Horace closed the window witness jumped over the fence back into the wood and made his way to the Hampstead Tube station with the intention of warning Birchill that Sir Horace Fewbanks was at home.

Captain Calderon lost not a moment in bringing his glass to bear upon her, and so intent was his scrutiny and examination that it was fully five minutes before he removed his eye from the tube. When he did so he handed the glass to me, and I in turn had a look at her.

And to this end, I shook from a strong and especial tube, a dust; and I caught the dust within a little cup; and the air did make an action upon that dust, as it were of chemistry; and the dust did boil and make a fizzing in the cup, and rose up and filled it with a liquid that was of simple water; yet very strange to see come that way; but ordinary after a time.

This important psychic organ also remains in its simplest shape throughout life, as a cylindrical tube, terminating with almost equal plainness at either end, and enclosing a narrow canal in its thick wall. However, the fore end is a little rounder, and contains a small, almost imperceptible bulbous swelling of the canal. This must be regarded as the beginning of a rudimentary brain.

"To Peter Collinson: "SIR Your kind present of an electric tube, with directions for using it, has put several of us on making electrical experiments, in which we have observed some particular phenomena that we look upon to be new.

When the tail is cut off, at the dotted line, the diameter of the opening and the thickness of the walls at that point should correspond with the dimensions of the tube to be sealed on.

This put me to thinking whether, if the ball was hung by a pack-thread and suspended by a loop on the tube, the electricity would not be carried down the line to the ball; I found it to succeed accordingly; for upon suspending the ball on the tube by a pack-thread about three feet long, when the tube had been excited by rubbing, the ivory ball attracted and repelled the leaf-brass over which it was held as freely as it had done when it was suspended on sticks or wire, as did also a ball of cork, and another of lead that weighed one pound and a quarter."

The Vicar called again one day, and hearing from Mrs Fidler that her master was over at the observatory, he came to the yard gate and thumped with his stick. "What's that?" said Uncle Richard, who was down upon his knees carefully adjusting a lens. "Tramp, I should think," said Tom, who was steadying the great tube of the telescope. "Then he must tramp," said Uncle Richard.

She could see nothing at all, nor could she hear anything except the rush of air past her ears as they plunged downward along the Tube. Whether she and Hank were alone, or the others were with them, she could not tell. But had some one been able to take a flash-light photograph of the Tube at that time a most curious picture would have resulted.