Magnets and Electric Currents: An Elementary Treatise for the Use of Electrical Artisans and Science Teachers |
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Page xiv
... Fixed Coil Galvano- meters - Sensibility of Galvanometers - Measurement of Electrical Resistance - Fall of Potential Method - Wheatstone's Bridge— Metric Bridge and Post Office Pattern of Bridge - Construction of Standard Resistances ...
... Fixed Coil Galvano- meters - Sensibility of Galvanometers - Measurement of Electrical Resistance - Fall of Potential Method - Wheatstone's Bridge— Metric Bridge and Post Office Pattern of Bridge - Construction of Standard Resistances ...
Page 3
... fixed lodestone . Each pole of the fixed lodestone attracts one end of the movable one , and repels the other end of the movable . one . It is clear , therefore , that the two poles of the lodestone are not alike in properties , and ...
... fixed lodestone . Each pole of the fixed lodestone attracts one end of the movable one , and repels the other end of the movable . one . It is clear , therefore , that the two poles of the lodestone are not alike in properties , and ...
Page 10
... fix a cork well soaked in paraffin wax at one end . Through a hole in this cork pass a rod of hard carbon of the kind sold for arc lamp carbons , the carbon being 5 inches long and an inch in diameter . Bind a piece of bare copper wire ...
... fix a cork well soaked in paraffin wax at one end . Through a hole in this cork pass a rod of hard carbon of the kind sold for arc lamp carbons , the carbon being 5 inches long and an inch in diameter . Bind a piece of bare copper wire ...
Page 45
... fix the exact position of the poles of a magnet , because they do not reside at definite points and are not placed exactly at the extremities of the bar . In the case of straight bar magnets it has been found that the distance between ...
... fix the exact position of the poles of a magnet , because they do not reside at definite points and are not placed exactly at the extremities of the bar . In the case of straight bar magnets it has been found that the distance between ...
Page 47
... curved lines , branching out from the two polar regions of the magnet . ( See Fig . 11. ) The lines are easily fixed as follows . Purchase from any mathematical instrument maker some of the photographic MAGNETIC FORCE AND MAGNETIC FLUX .
... curved lines , branching out from the two polar regions of the magnet . ( See Fig . 11. ) The lines are easily fixed as follows . Purchase from any mathematical instrument maker some of the photographic MAGNETIC FORCE AND MAGNETIC FLUX .
Other editions - View all
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.
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.
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