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Its lineal ancestor was the magneto-electric machine, in the early construction of which figure the names of Siemens, Wilde, Ladd, and earlier and later electricians. Kidder's medical battery used forty years ago or more, and still used and purchasable in its first form, was a dynamo.
They knew then, about 1835 to 1870, of the laws of induction as applied to the electro-magnet, or in small machines the generating power, so called, of the magneto-electric arrangement embodied, as a familiar example, in Kidder's medical battery. There is a long list of those inventors, American and European.
The wonderful completeness of Faraday's researches into the production of electricity from magnetism may be inferred from the fact that all the forms of magneto-electric induction known to-day namely, self-induction, or the induction of an active circuit on itself; mutual induction, or the induction of an active circuit on a neighboring circuit; and electro-magnetic induction, and magneto-electric induction, or the induction produced in conductors through which the magnetic flux from electro and permanent magnets respectively is caused to pass were discovered and investigated by him.
A diminution of temperature contracts the air in the bulb, causes the mercury to rise in the side of the tube, and closes the valve. Besides this, there was 'an improved magneto-electric machine, for medical use, with a new arrangement, by which the shock is graduated by means of a glass tube, in which a wire is made to communicate with water, so as to produce at first a slight shock; by gradually pressing down the wire attached to a spiral spring, the shock is received in its full force.
Muirhead and Hopkinson have also designed a magneto-electric alternating current machine; but as it closely resembles the machines described, with the exception that permanent magnets are employed as field magnets, we need not dwell upon it further. Engineering. By GEORGE LEUCHS.
When mechanical power is employed for producing a current by means of a magneto-electric or dynamo-electric machine or, to use a better expression, by means of a mechanical generator of electricity it is necessary in reality to expend a greater quantity of power than i squaredR in order to make up for losses which result either from ordinary friction or from certain electro magnetic reactions which occur.
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