Magnetic Fields of Force: An Exposition of the Phenomena of Magnetism, Electro-magnetism, and Induction Based on the Conception of Lines of Force, Part 1

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Longmans, Green, and Company, 1897 - Magnetism - 297 pages
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Contents

CHAPTER III
54
IAOK 72
72
THE MKASUREMENT OF FIELDS OF JOKCE 7G A Static methods of vicasuring magnetic magnitudes the absolute system of units
76
Comparison of magnetic force with the force of gravitational attraction
78
the dyne
79
Measurement of magnetic attractions in dynes by means of the balance
80
Dimensions of physical quantities dimensions of force
81
The Newtonian law of universal attraction
82
Strength of pole
83
Unit strength of pole
85
Dimensions of strength of pole
87
Conception and measurement of strength of field
88
Mechanical force exerted upon a pole of determinate strength by a field of given intensity
89
Dimensions of fieldintensity
90
Number of lines of force proceeding from a pole of given strength
91
Deflection of a declination needle by a bar magnet
92
Couples acting upon a magnetic needle in a uniform field
93
Comparison of fieldintensities by the method of oscillations
94
Quantities which determine the period of oscillation of a needle
95
Determination of fieldintensities in absolute measure by oscillations
96
Determination of magnetic moments in absolute measure by oscillations
97
THE REPRESENTATION OF FIELDS OF FORCE
99
Flux of force
101
Law of the conservation of the flux of force
102
Maxwells unit solenoids
103
Diagram of a unipolar field
104
Estimation of fieldintensity from the diagram
105
Diagram of a bipolar magnetic field
106
Combination of two fluxofforce diagrams
108
Evaluation of the fieldintensity at any point of a bipolar magnetic field by means of the diagram
110
Tlie fundamental property of the magnetic induction
112
Diagrams of homogeneous fields
113
Combination of more than two fields
115
CONSTITUTION OF MAONETS AND MAGNETIC FIELDS
116
Chains of molecular magnets
117
Model of a bar magnet composed of molecular magnets
118
The toroid or anchorring
119
The divided toroid
120
Dimensions of magnetisation
121
Magnetic screening
123
B Mechanical interpretation of the dynamical properties of magnetic
150
Experiments on vortex motion
157
Cyclic motions
164
CHAPTER VIII
180
B Circular currents
191
Conception of a current
197
Differences between the fields of magnets and of galvanic currents
203
B Quantitative relations
216
The characteristic magnitude for the field of a current con ception of currentstrength
221
Dimensions of currentstrength 22
224
Measure of a current in absolute units the unit of current strength the ampere
225
The tangent galvanometer
227
Work of electromagnetic forces
228
Energy of the field of a currentloop
231
The field of a current as a monocyclic mechanism
232
Electromagnetic fluxofforce diagrams
233
Graphic representation of the system of lines of force due to arectilinear current
234
Deduction of the fieldintensity at any point of an axially symmetrical field from the diagram
236
CHAPTER X
240
Multipliers
242
Galvanometer
243
Solenoids
244
Equivalence of solenoids and bar magnets
246
Bobbins
248
Magnetic effects of bobbins
250
Spring amperemeter
253
Uniform field within a helix
254
Magnetising helix
255
The electromagnet
256
CHAPTER XI
261
The lefthand rule
264
Mechanical interpretation of the dynamical forces
266
Electromagnetic rotations
268
Magnetoelectric motor
270
Rotation of radial currents
273
Movements of a flexible conductor in the field of a bar magnet
274
Quantitative law of the mechanical action upon a movable currentconductor in a stationary magnetic field
276
RIAXAI AND MULTIAXAL MAGNETIC FIELDS OF FORCE
279
B Electrodynamic fluxofinduction diagrams
292

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