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The rapidity of the several instruments in use may be given as follows: Cooke and Wheatstone's needle telegraph of Great Britain, 900 words per hour; Froment's dial telegraph, of France, 1200; Bregnet's dial telegraph, also French, 1000; Sieman's dial telegraph, formerly used upon the Prussian lines, 900; Bain's chemical, in use between Liverpool and Manchester, and formerly to a considerable extent in the United States, 1500; the Morse telegraph, in use all over the world, 1500; the House printing, used in the United States to a limited extent, and in Cuba, 2800; Hughes's and the combination instruments, 2000.
'If, says Faraday, 'the two ends of the wire in Professor Wheatstone's experiments were immediately connected with two large insulated metallic surfaces exposed to the air, so that the primary act of induction, after making the contact for discharge, might be in part removed from the internal portion of the wire at the first instance, and disposed for the moment on its surface jointly with the air and surrounding conductors, then I venture to anticipate that the middle spark would be more retarded than before.
Wheatstone's telegraph would have served the purposes of humanity and probably have been universally adopted, had not a better one been invented almost before it was established.
A skilful telegraphist can transmit twenty-five words a minute with the single-current key, and nearly twice as many by the double-current key, and if we remember that an average English word requires fifteen separate signals, the number will seem remarkable; but by means of Wheatstone's automatic sender 150 words or more can be sent in a minute.
"I tried to get him to stop, sir, saying he had done quite enough last night for all next day; but he told me it was his business to get the tire put on Farmer Wheatstone's cart-wheel to-day just as much as it was his business to go in the life-boat yesterday. So he would go, and Aggy wouldn't stay behind." "Fine fellow, Joe!" I said, and took my leave.
Subterranean wires and submarine cables transmit slowly. Wheatstone's experiments were made fifty-four years ago, and have not since been confirmed. I would say light is the faster, for electric currents are always retarded by the medium. WONDERFUL PHOTOGRAPHY. Dr.
This is known as Wheatstone's bridge and is still in use in every electrical and physical laboratory. He also invented a sound telegraph by which signals were transmitted by the strokes of a bell operated by the current at the receiving end of the circuit.
The Tudors were a coarse, fierce race; but it will not do to lay the faults of their times upon them only. Look at Elizabeth's ministers. They had about as much notion of religious tolerance as they had of Professor Wheatstone's telegraph. It was not a growth of that age. Milverton. I do not know. You have Cardinal Pole and the Earl of Essex, both tolerant men in the midst of bigots. Ellesmere.
He has been experimenting and making discoveries on celestial electricity, and he says that Wheatstone's and Steinheil's telegraphs must be so influenced in a highly electrical state of the atmosphere as at times to be useless, they using the deflection of the needle, while mine, from the use of the magnet, is not subject to this disturbing influence.
The message was received without difficulty and repeated back to Morse at Washington. The magnetic telegraph was a reality. Still the general public remained unconvinced. As in the case of Wheatstone's needle telegraph a dramatic incident was needed to demonstrate the utility of this new servant. Fortunately for Morse, the telegraph's opportunity came quickly.
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