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Magnets and Electric Currents. an Elementary Treatise for the Use of ...
J. A. Fleming
No preview available - 2008
acting alternating current amperes angle armature arranged axis battery boards body called cell centimetre circuit coil conductor connected consider constant constructed continuous copper core creates crown 8vo curve difference direction divided dynamo edition effect electric current electromagnet electromotive force ends energy Engineers equal fact field fixed flowing follows galvanometer give given heat Hence illus inch increased inductance iron joined known length machine magnetic flux density magnetic force magnetising magnetomotive force mass material mean measured mechanical metals meter move needle obtain passed periodic piece plates pole position potential Practical primary produced proportional quantity represent resistance resultant ring round scale secondary shown square steel strength student surface Tables taken temperature terminals transformer tube turns unit voltage voltmeter volts watts weight whole wire York zinc
Page 123 - Ampere, which is one-tenth of the unit of current of the CGS system of electromagnetic units and which is represented sufficiently well for practical use by the unvarying current which, when passed through a solution of nitrate of silver in water, in accordance with a certain specification, deposits silver at the rate of 0.001118 of a gramme per second.
Page 123 - As a unit of resistance, the international ohm, which is based upon the ohm equal to 10" units of resistance of the CGS system of electromagnetic units, and is represented by the resistance offered to an unvarying electric current by a column of mercury at the temperature of melting ice, 14.4521 grams in mass, of a constant cross-sectional area and of the length of 106.3 centimetres.
Page 124 - Now, therefore, her Majesty, by virtue of the power vested in her by the said Act, by and with the advice of her Privy Council, is pleased to approve the several denominations of standards set forth in the schedule hereto as new denominations of standards for electrical measurement.
Page 124 - The Volt, which has the value IO8 in terms of the centimetre the gramme and the second of tune being the electrical pressure that if steadily applied to a conductor whose resistance is one ohm will produce a current of one ampere, and which is represented by -6974 (jgg) of the electrical pressure at a temperature of 15° C.
Page 12 - The Drainage of Fens and Low Lands by Gravitation and Steam Power. By WH Wheeler. 8 plates, 175 pp., 8vo. (1888.) 12s.
Page 22 - Gas Works : their Arrangement, Construction, Plant and Machinery. By F. Colyer. 31 folding plates, 134 pp., 8vo. (1884.) 8s. 6d. net. Lighting by Acetylene. By F.
Page 23 - HISTORICAL AND BIOGRAPHICAL. Extracts from the Private Letters of the late Sir William Fothergill Cooke, 1836-9, relating to the Invention and Development of the Electric Telegraph ; also a Memoir by LATIMER CLARK. Edited by FHWEBB, Sec.
Page 30 - Tables of Logarithms and Trigonometric Functions. By EV Huntington. Ninth thousand, 34 pp., square 8vo, limp buckram, with cut lateral index. (New York, 1911.) 3s.