Download Electric Arc Lighting by Edwin J. Houston PDF

By Edwin J. Houston

Electro-T echnical sequence, is written in language equivalent to will allow most of the people easily to appreciate the prime ideas underlying the paintings of electrical arc lighting fixtures, with none distinct education in electrotechnics. The swift development of out-door illumination through the arc mild has rendered it a question of necessity that the general public could be capable of own a extra prolonged wisdom of the rules underlying the creation of the voltaic arc than will be acquired from the day-by-day newspapers.
(Typographical mistakes above are because of OCR software program and do not ensue within the book.)

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The action of an electromotive force on a circuit bears an analogy to the action of If, for expressure on a liquid mass. ample, a pipe filled, into a circuit, that with water be bent -is, connected so as to form an endless path, the water it contains ELEMENTARY ELECTRICAL PRINCIPLES. 30 cannot be set in motion, unless pressure be brought to bear upon some part of its mass. i. , As soon as this a water liquid, the is done, motion, current, will take place in the direction of which is always from the position of greatest, to the position of least pressure.

As very important examples of a few resistances of well-known we may take the following The ordinary Bell telephone has a resist- apparatus : ance of about 75 ohms. An descent ordinary 16-candle-power incanlamp has a resistance of about 250 ohms, when hot. The resistance of iron telegraph wire is a mile of ordinary about 13 ohms. Electromotive forces are measured in units of electromotive force called volts. ELEMENTARY ELECTRICAL PRINCIPLES. 45 All electric sources produce electromotive forces, and it is these E.

45 All electric sources produce electromotive forces, and it is these E. M. , acting on a conducting circuit, which cause electricity to flow through the circuit. well-known A electric source, called the blue-stone voltaic cell, one produces an E. M. F. of approximately When it is desired to obtain a volt. higher E. M. F. from blue-stone cells, it is necessary to connect a number of separate cells in series, so as to permit them to act Such a combination is as a single source. called a voltaic battery.

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