Electricity for Public Schools and Colleges

Front Cover
Longmans, Green, and Company, 1893 - Electric power - 451 pages

From inside the book

Contents

Cases of Continuous Rotation
9
Potentials Due to Circuits
10
SECTION
17
Magnetic Induction takes place along the Lines of Force
19
Series Arrangement of Arc Lamps
23
Definition
29
Modification of Earths Lines of Force by the Presence of Iron
30
To find the Inclination or
36
CHAPTER IV
42
The Fluid Theories of Electricity
48
Variation with Time
53
INTRODUCTORY CHAPTER ON POTENTIAL SECTION PAGE I Quantity of Electrification
65
Electrical Level or Electrical Potential
66
Measurement of differences of Electrical Level by Work
67
Elementary Ideas on Capacity
68
Lines of Force and Equipotential Surfaces
69
Induction from a Potential Point of View
70
Necessity of distinguishing Sign of Charge and Sign of Potential
74
CHAPTER VI
76
Experiments with the two Condenser Plates
78
Discussion of the Terms Bound and Free
81
Conditions Affecting the Magnitude of the Bound Charge
82
An Isolated Body considered as the Limiting Case of a Condenser
83
Leyden Jars
85
The Unit Jar
86
Cascade arrangement of Leyden Jars
88
Nature of the Leyden Jar Charge
90
Various Effects of the Discharge
91
Induction Effects of the Discharge
94
Wheatstones Sparkboard
96
The Condensing Electroscope
98
CHAPTER VII
100
Application to Induction Machines
102
Varleys Induction Machine
103
Sir W Thomsons Replenisher
104
The Voss Machine
105
The Holtz Machine
108
CHAPTER X
126
Equipotential Surfaces
133
Statement of some further Theorems on Lines of Force
139
SECTION PAGE 19 Potential of an Isolated Sphere
141
Capacity of an Isolated Sphere
142
Distribution from the Potential Point of View
143
Potential and Density distinguished
144
Important Case of a Spherical Condenser
145
The Plate Condenser
147
Formulæ for Capacities c
148
Energy of Charging and Discharging
150
Examples in Energy of Discharge
151
Energy of Discharge in the Cascade Arrangement of Leyden Jars
152
Electroscopes and Electrometers
153
Sir William Thomsons Quadrant Electrometer
155
Uses of the Quadrant Electrometer
158
Examples in Energy of Discharge c
159
General Consideration of Electrostatic Fields of Force
161
CHAPTER XI
163
Galvanis Experiment
164
Voltas Experiments and Views
165
Voltas Pile from Voltas point of View
167
Voltas Cell and the Couronne des Tasses from Voltas point of View
169
The Contact and Chemical Theories
170
Theory of the Simple Voltas Cell
171
Digression on the Galvanometer
173
Polarisation
175
Constant Batteries
176
Remarks on Cells and on Batteries
180
THE CHEMICAL PHENOMENA ACCOMPANYING THE PASSAGE OF THE CURRENT I Introductory
182
Chemical Effects General View
183
SECTION PAGE 4 Grothüsss Hypothesis Nature of Electrolysis
186
Primary and Secondary Decompositions
188
Simultaneous Decompositions
189
Further on Faradays Laws of Electrolysis
190
Electroplating
191
Polarisation of the Electrodes
194
Secondary or Storage Cells
196
Plantés SecondaryCell
197
Faures Accumulator
200
CHAPTER XIII
201
Statement of Ohms Law
203
Resistance further Discussed
204
Conductivity
206
Application of Ohns Law in a Simple Case
207
Graphic Representation of Ohms Law
209
Applications of the Graphic Method
211
Shunts
214
Fall of Potential through the Circuit
215
Kirchhoffs Two Laws
216
Maximum Current with a given Battery
219
CHAPTER XIV
221
Resistance Coils and Resistance Boxes
222
Wheatstones Rheostat
224
Wheatstones Bridge General Principle
226
Slideform of Wheatstones Bridge 2 3
228
Wheatstones Bridge Resistance Box Form
229
Resistance of a BatteryCell
230
Measurement of E M F
231
Electrometer Methods Open Circuit
232
Voltmeter Galvanometers
233
Method of Opposition
234
Joules
241
Distribution of Heat in the Circuit
244
The Neutral Point
261
ThermoDiagrams 8 Peltier Effect Observed Facts
263
The Thomson Effect
264
Theory of the Simple ThermoCell
265
Theory of the Peltier and Thomson Effects
268
CHAPTER XVII
271
The and Directions of the Lines of Force
273
Simple Form of Galvanometer 4 Relation of Strength of Field to CurrentStrength
275
SECTION PAGE 5 The Tangent Galvanometer
276
The Sine Galvanometer
279
The Multiplying Galvanometer
280
The Controlling Magnet Method
282
Sir W Thomsons Mirror Galvanometer
283
The Differential Galvanometer
285
The Ballistic Galvanometer
286
Sir W Thomsons Graded Potential Galvanometer
289
Sir W Thomsons Graded Current Galvanometers
290
Webers ElectroDynamometer
291
Some General Observations on Galvanometers
292
Galvanometers for Practical or Commercial use
293
ACTIONS BETWEEN CURRENTS AND MAGNETIC POLES MAG NETIC EQUIVALENT OF A CURRENT ACTION BETWEEN CURRENTS A...
294
The Absolute System of ElectroMagnetic Units
297
Summary of ElectroMagnetic Units see 3
298
The Dimensions of the Derived Units
299
Field due to a Circular Current
302
Magnetic Potentials due to Magnetic Shells
304
Magnetic Equivalent of an Electric Circuit
306
This Equivalence is for the External Field only
307
Reaction of a Pole on an Element of Current
308
Action of a Pole on an Incomplete Circuit
310
Action of the Earths Field on Currents Completely or Partly Mobile
311
Continuous Rotations of Currents
313
LAWS OF THE MOVEMENTS OF CURRENTS AS DEDUCED FROM THE CONSIDERATION OF MAGNETIC FIELDS AND POTENTIALS 1 M...
315
SOLENOIDS ELECTROMAGNETS DIAMAGNETISM AND ELECTROOPTICS 1 Cylindrical Magnet built up of Circular Laminæ 2 The Ideal Sole...
324
Ampères Theory of Magnetism
326
Solenoid and Hollow Cylindrical Magnet Contrasted
327
Matter Placed in a Uniform Magnetic Field of Force
328
Movements of Small Bodies in a NonUniform Magnetic Field 8 The Setting of a Long Body in a Uniform Magnetic Field
330
A Long Body in a NonUniform Field 10 Solenoid With and Without an Iron Core
332
ElectroMagnets
333
Paramagnetic and Diamagnetic Phenomena
334
PseudoDiamagnetic Phenomena 14 Relative Magnetism or Diamagnetism
335
Is there Absolute Diamagnetism?
336
Rotation of the Plane of Polarisation in a Magnetic Field
337
Other ElectroOptical Phenomena 18 The ElectroMagnetic Theory of Light
340
CHAPTER XXI
342
General Account of Induction Phenomena
343
General Reason for Induced Currents
346
More Exact Reasoning in a Simple Case
347
General Expression for Induced E M
349
Induction where there is no Initial Current
351
Direction of the Induced Currents Lenzs
352
Constant Induced Currents
355
Changes that Give Induced Currents
357
ARAGOS DISC RUHMKORFFS COIL AND OTHER CASES
363
Practical Difficulties to be Overcome
369
Various Phenomena of the Secondary Discharge
376
CHAPTER XXIII
383
The Gramme
390
SECTION PAGE 16 Magneto Machines
395
SeparatelyExcited Machines
396
SeriesExcited Machines
397
ShuntDynamos
398
Other Methods of Winding
399
The Ferranti Alternate Current Machine
401
CHAPTER XXIV
402
SeriesDynamos as Motors
403
General Remarks on Dynamos and Motors
404
Formulæ for Activity c Maximum Activity
405
Efficiency
408
S P Thompsons Diagrams
409
Electric Railways and TramCars Telpherage c
411
Distribution of Potential in the Circuit of a Dynamo and Motor
412
Work done per Second upon a Dynamo as Related to the Velocity v of Rotation
415
CHAPTER XXV
416
Telegraphic Alphabets
419
The Needle System of Telegraphy
420
The Morse System
421
Relays
422
Earth Currents Condenser System of Working
424
Insulation of Wires
426
Telephones Introductory
428
The Bell Telephone
429
Telephones with External Source of Current
431
Properties of Selenium The Photophone
432
General Account of Electric Lighting
433
Magnetic polestrength
xxiv
Equivalentresistance
xxxii
328
xxxiii
330
xlv
271
xlvi
335 335 336
xlvii
131
xlviii
275
xlix
352
l
357
li
395
lii
57
Electric and Magnetic density
59

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