Magnets and Electric Currents: An Elementary Treatise for the Use of Electrical Artisans and Science Teachers |
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Page 170
... Machine . ( The Disc revolves Clockwise . ) is placed between the poles of a horseshoe magnet , so that the North ... machine so con- structed was was the parent of all subsequent dynamo machines in which electric current energy is ...
... Machine . ( The Disc revolves Clockwise . ) is placed between the poles of a horseshoe magnet , so that the North ... machine so con- structed was was the parent of all subsequent dynamo machines in which electric current energy is ...
Page 208
... machines . It should be noted that a piece of iron , as a whole , has no tendency to move along the lines of a uniform field , but if one end is in a place of stronger field than the other , the iron will tend to move until equilibrium ...
... machines . It should be noted that a piece of iron , as a whole , has no tendency to move along the lines of a uniform field , but if one end is in a place of stronger field than the other , the iron will tend to move until equilibrium ...
Page 213
... machines , these legs were made rather long and thin , and the magnetic leakage of flux from leg to leg was large . By adopting shorter and thicker legs , Dr. Hopkinson improved the machine , and obtained a greater inter - polar ...
... machines , these legs were made rather long and thin , and the magnetic leakage of flux from leg to leg was large . By adopting shorter and thicker legs , Dr. Hopkinson improved the machine , and obtained a greater inter - polar ...
Page 216
... machines , generally nothing but the best cast steel , or wrought iron of the highest permeability , is used for field magnet construction . If the coil of an electromagnet is traversed by alter- nating or intermittent electric currents ...
... machines , generally nothing but the best cast steel , or wrought iron of the highest permeability , is used for field magnet construction . If the coil of an electromagnet is traversed by alter- nating or intermittent electric currents ...
Page 217
... machines the armature , or revolving bobbin of wire , by which the current is generated , consists essen- tially of an iron core , wound over with covered copper wire or with copper bars , and it revolves in a strong mag- netic field ...
... machines the armature , or revolving bobbin of wire , by which the current is generated , consists essen- tially of an iron core , wound over with covered copper wire or with copper bars , and it revolves in a strong mag- netic field ...
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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.
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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.
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