Magnetic Fields of Force: An Exposition of the Phenomena of Magnetism, Electro-magnetism, and Induction Based on the Conception of Lines of Force, Volumen1

Portada
Longmans, Green, and Company, 1897

Dentro del libro

Contenido

Magnetic permeability of different substances
14
Natural magnets fitted with polepieces
15
The keeper
16
Communication of magnetic properties to steel
17
Production of artificial magnets
18
Immaterial nature of magnetism
20
Compound magnets
23
Magnets of special forms
24
The horseshoe magnet
25
Magnets with one degree of freedom
29
Mutual action of two long bar magnets placed side by side
45
Transverse effects rotatory displacements
51
Values of the magnetic elements at different places magnetic
63
Luminous phenomena of the poles
69
B Magnetism as an extraterrestrial influence
72
Unit strength of pole
85
Number of lines of force proceeding from a pole of given
91
Determination of magnetic moments in absolute measure
97
CHAPTER V
99
Tubes of force
100
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
Diagrams of homogeneous fields
113
Combination of more than two fields
115
CHAPTER VI
116
Chains of molecular magnets
117
95
118
The toroid or anchorring
119
The divided toroid
120
Dimensions of magnetisation 121
121
Magnetic screening
123
Screening of a magnetic needle by soft iron
125
Conception of magnetic polarisation
126
Paramagnetic and diamagnetic substances
128
Flux of magnetic induction
130
Dimensions of the magnetic induction
131
Tubes of induction and flux of induction
132
Susceptibility
133
The fundamental property of the magnetic induction
134
Magnetomotive force
135
Magnetic resistance
136
Fundamental law of the magnetic circuit
137
E Energy in the magnetic field
138
Localisation of the energy of the field
139
Measure of the energy of the magnetic field
140
CHAPTER VII
143
Experiments on vortex motion
157
Generation of vortices in water
158
Vortex lines in the vortex filaments
159
Direction of the vortex lines
160
Strength of a vortex
161
Experiments with smoke rings
162
Cyclic motions
164
Cyclic coordinates and cyclic velocities
166
Energy of cyclic systems the cyclic moment
167
Forces corresponding to cyclic coordinates
168
Extension of the conception of a cycle
169
Imperfect cycles
173
Monocycles dicycles and polycycles
174
Slowly varying parameters
175
CHAPTER VIII
180
B Circular currents
191
A Electrodynamic action between two different currentconductors
195
Conception of a current
197
Behaviour of crossed currents
201
Differences between the fields of magnets and of galvanic currents
203
The thumbrule Ampères swimming rule
212
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 ampère
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 a rectilinear 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 ampèremeter
253
Uniform field within a helix
254
Magnetising helix
255
The electromagnet
256
Some applications of electromagnets
258
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
continuous rotation
290

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