Electricity, Magnetism, and Electric Telegraphy: A Practical Guide and Handbook of General Information for Electrical Students, Operators, and Inspectors

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D. Van Nostrand Company, 1894 - Electric engineering - 375 pages
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Page 349 - There was a time when I thought I knew something about the matter; but the longer I live, and the more carefully I study the subject, the more convinced I am of my total ignorance of the nature of electricity.
Page 96 - All galvanometers, then, consist of a coil of insulated wire and a magnetic needle delicately suspended, so as to be easily deflected by the passage of a current through the coil.
Page 36 - Cells thus placed are said to be arranged in series. When thus arranged, the electromotive force of each cell is added to that of its neighbor, and the resulting electromotive force is equal to the sum of the electromotive forces of all the cells. Assuming the EMF of each cell in Fig. 13 to be i volt, the total EMF developed...
Page 170 - Fahrenheit, and the resistance be increased a certain amount by a rise of one degree in temperature, it will be increased by the next •degree of rise at the same rate per cent., calculated on the original resistance, plus the amount increased by the first degree of rise.
Page 88 - ... Galvanometer. A galvanometer whose needle comes quickly to rest instead of repeatedly swinging to and fro, through being heavily damped. Dielectric. Any material which offers high resistance to the passage of an electric current. Difference of Potential. When electricity moves, or tends to move, from one point to another, there is said to be a difference of potential between them.
Page 346 - this system has not been found of practical advantage"; and if we may believe another writer, the systems he describes " must be looked upon as little more than feats of intellectual gymnastics — very beautiful in their way, but quite useless in a practical point of view.
Page 93 - In other words, it is the amount of electricity furnished in one second by an electro-motive force of one volt in a circuit having a total resistance of one ohm.
Page 322 - ... to the right. The motion of each secondary pendulum soon increases, until it reaches its proper extent. The pendulums once set a-going are, however, not intrusted solely to the stimulus of the electricity, but are moved by their own weights, as in ordinary clocks, so that if the electricity ceased to be sent to them, they would go on without it. In the second class of electric clocks, the electricity is not charged immediately...
Page 267 - Thus the fine wire forms a secondary circuit of high resistance through the lamp, which circuit is independent of the arc between the carbons, and is always closed. It follows from the difference in direction of the current in the two helices, that the fine-wire helix will constantly tend to neutralize the magnetism produced by the coarse-wire or principle helix.
Page 51 - ... distribution of the magnetic force around it, as upon the direction of the force through it. I will not, however, anticipate matters by entering further upon this subject at present. IV. COMPARATIVE VIEW OF PARAMAGNETIC AND DIAMAGNETIC PHENOMENA. 1 . State of Diamagnetic Bodies under magnetic influence. When a piece of soft iron is brought near to a magnet, it is attracted by the latter: this attraction is not the act of the magnet alone, but results from the mutual action of the magnet and the...

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