Magnets and Electric Currents: An Elementary Treatise for the Use of Electrical Artisans and Science Teachers |
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Page 14
... electromagnet is often re- quired to magnetise steel bars or needles . A suitable form of electromagnet for such purpose may thus be made . A strip of very soft Swedish iron is taken , about 2 feet 14 MAGNETS AND ELECTRIC CURRENTS .
... electromagnet is often re- quired to magnetise steel bars or needles . A suitable form of electromagnet for such purpose may thus be made . A strip of very soft Swedish iron is taken , about 2 feet 14 MAGNETS AND ELECTRIC CURRENTS .
Page 15
... taken , about 2 feet long , 3 inches wide and I inch thick . This is bent twice at right angles about 6 inches from either end , so as to give it a horse - shoe shape . The ends may be planed flat . This horse - shoe is then wound over ...
... taken , about 2 feet long , 3 inches wide and I inch thick . This is bent twice at right angles about 6 inches from either end , so as to give it a horse - shoe shape . The ends may be planed flat . This horse - shoe is then wound over ...
Page 24
... taken together is increased . In any inclosed space containing portions of matter , the total gravitational energy in that space is increased by separating the bodies as far apart as possible . We have not been able yet to obtain any ...
... taken together is increased . In any inclosed space containing portions of matter , the total gravitational energy in that space is increased by separating the bodies as far apart as possible . We have not been able yet to obtain any ...
Page 28
... taken as a standard , is called a physical magnitude or physical quantity . The act of making a comparison between the physical magnitude in question and another of the same nature made in respect of the particular quality which we are ...
... taken as a standard , is called a physical magnitude or physical quantity . The act of making a comparison between the physical magnitude in question and another of the same nature made in respect of the particular quality which we are ...
Page 29
... taken as the unit of length . As a practical matter , most civilised nations possess certain bars of very unchangeable metal , such as platinum . On these are made two marks , and the unit of length is de- fined by law to be the ...
... taken as the unit of length . As a practical matter , most civilised nations possess certain bars of very unchangeable metal , such as platinum . On these are made two marks , and the unit of length is de- fined by law to be the ...
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Magnets and Electric Currents. an Elementary Treatise for the Use of ... J. A. Fleming No preview available - 2008 |
Common terms and phrases
acid alternating current ammeter ampere-hour ampere-turns amperes angle armature axis battery C.G.S. units called carbon cell Clark cell conductor constant constructed continuous current copper wire crown 8vo cubic centimetre current flowing current in amperes curve deflection diagram difference of potential direction dynamo electric current electrodynamometer electrolyte electromagnet electromotive force ends energy Engineers equal field magnet fixed galvanometer grammes heat Hence illus inch inductance instant instrument insulated iron core length machine magnetic circuit magnetic field magnetic flux density magnetic force magnetic pole magnetising magnetomotive force mean measured metals meter movable coil needle netic North pole passed permeability plates position potential difference potentiometer primary current produced quantity R.M.S. value represent resistance ring coil rotation round scale Second edition secondary circuit shunt soft iron solenoid square centimetre steel strength tangent temperature terminals transformer tube velocity voltage voltmeter volts watt-hour wattmeter watts York zinc ΙΟ
Popular passages
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 55 - Engineering Law. By A. HARING. Demy 8vo, cloth. (New York.) Vol. I. THE LAW OF CONTRACT. 518 pp. (1911) net 17 o The Gyroscope, an Experimental Study.
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.
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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.
Page 41 - Organization of Gold Mining Business, with Specimens of the Departmental Report Books and the Account Books. By Nicol Brown. Second edition, 220 pp., fcap. folio. (1903.) £1 5s.