The Electric Telegraph

Cover The Electric Telegraph
The Electric Telegraph
Robert Sabine
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Ampere observed that when a positive current moved in a wire from south to north, over and parallel to a magnetic needle, the latter was deflected, with a tendency to place itself at right angles to the wire, the north pole pointing westward. Subsequently, Biot and Savart have occupied themselves with the task of establishing the relation between the deflection of the needle and the distance of the galvanic current moving in a straight conductor of infinite length, and have found that : " The t
...otal effect of an infinitely long and straight con- ductor upon any magnetic element is in inverse proportion to the distance of the element from the nearest point of the wire. " For the effect of a circular current upon a magnetic element, "Weber has given a mathematical development, from which he proves that when the distance of the magnetic element from the centre point of the current circle is x, its diameter y, the intensity of the current g, and the magnetic intensity of the element which is deflected /*, the force J with which the deflection takes place is expressed by which, translated into words, is, that a magnetic element in the axis of a circular current is attracted or repelled from the SCIENCE AND PRACTICE.

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