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Updated: May 2, 2025
It was worked by two circuits, and as the type revolved a hammer, actuated by the current, pressed the required letter on the paper. In 1840 Wheatstone also brought out his magneto-electrical machine for generating continuous currents, and his chronoscope, for measuring minute intervals of time, which was used in determining the speed of a bullet or the passage of a star.
By an extensive series of experiments with the above apparatus the author succeeded in proving that heat is evolved by the coils of the magneto-electrical machine, as well as by any other part of the circuit, in proportion to the resistance to conduction of the wire and the square of the current; the magneto having, under comparable circumstances, the same calorific power as the voltaic electricity.
Weber was also expert in the management of magneto-electrical currents. Gauss, with the aid of his co-worker, constructed a line of telegraph, and sent signals by the agency of the magnetic current to a neighboring town. This was nearly ten years before Morse had fully succeeded in like experimentation.
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