A Guide to Electric Lighting for the Use of Householders and Amateurs

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Macmillan and Company, 1892 - Electric lighting - 189 pages
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Page 131 - Every switch or commutator should be of such construction as to comply with the following condition, namely — That, when the handle is moved or turned to and from the positions of "on " and " off," it is impossible for it to remain in any intermediate position, or to permit of a permanent arc, or heating. 19. The handles of every switch must be completely insulated from the circuit. 20. The main switches of a building should be placed as near as possible to the point of entrance of the conductors...
Page 31 - If any straight conductor ab, the direction of whose length is at right angles to the lines of force, is moved in a uniform magnetic field in a direction at right angles to the lines of force of the field and to its own length, and at such a uniform velocity that at the end of unit time (1 second) it reaches the position a
Page 20 - The strength of the current is equal to the electro-motive force divided by the resistance ; this is known as Ohm's law...
Page 15 - ... collected in inverted glass bottles, filled with warm water. In order to comprehend the theory of this process, it must be premised that muriatic acid consists of chlorine and hydrogen. The peroxide of manganese is composed of manganese and oxygen. When these compounds react on one another, the peroxide of manganese gives up a portion of its oxygen to the hydrogen of the muriatic acid, in consequence of which water is generated, and chlorine (the other ingredient in muriatic acid) is liberated....
Page 61 - I ampere, and this without taking into account the resistance of the conductors which lead from the dynamo to the lamps.

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