Magneto-electric and Dynamo-electric Machines: Their Construction and Practical Application to Electric Lighting and the Transmission of Power, Volume 1

Front Cover
D. Van Nostrand, 1884 - Electric engineering
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Contents

Movement of a Magnet towards a Closed Wire Ring 87
37
Rotation of an Armature over the Poles of a Magnet
51
The Magnetic Field of Force
53
I
56
Electrical Energy
59
Ayrton Perrys Dynamometer 01
63
The Brake Dynamometer 07
67
The Bracket Dynamometer
71
SECTION PAGE 20 Ohms Law and the Units of Electric Measurement
75
ElectroDynamometer made by Siemens Halske
78
The Galvanometers Ammeter and Voltmeter of Ayrton Perry and Deprez
80
Siemens Halskes Torsion Galvanometer
84
Edisons Registering Apparatus
85
The Electric Dynamometer
88
Measurement of Light
90
Division of Current
95
PART III
99
Stohrers MagnetoElectric Machine
101
The large MagnetoElectric Machines of the Socidte 1Alliance and Holmes
104
The Siemens Armature
110
Wildes MagnetoElectric Machine
115
The De Meritens Machine
123
PART IV
129
Siemens Principle of DynamoElectric Machines and the claims of others on that point
141
Siemens DynamoElectric Machine
146
Siemens Halskes DynamoElectric Alarm and Mine Exploder
149
Smiths Electric Blasting Machine
152
Ladds TwoArmature DynamoElectric Machine
154
Siemens Halskes TwoArmature DynamoElectric Machine
159
Hochhausens DynamoElectric Machine for Galvanoplastic Purposes
160
Westons DynamoElectric Machine for Galvanoplastic Purposes
164
Mohring and Baurs DynamoElectric Machine
167
The Brush Light Machine
169
PART V
172
The Thomson SphericalArmature DynamoElectric Machine
189
MAGNETOELECTRIC AND DYNAMOELECTRIC MACHINES FOR THE PRODUCTION OF CONTINUOUS CURRENTS SECTION PAgE 46 Pa...
204
The Elias Machine and that of Worms de Romilly
219
Construction of the Gramme Armature
224
The Gramme Machine
225
The Gramme Machine for Hand or FootPower
229
The Gramme Large DynamoElectric Machine for Galvanoplastic Purposes
231
Gramme Large DynamoElectric Machines for Electric Light
235
The FullerGramme Machine
250
Fitzgeralds Machine
299
The Gulcher Machine
301
Siemens Halskes Magneto and DynamoElectric Cylinder Machines System v HefnerAlteneck
303
The SiemensHalske Small Machines for Laboratory Purposes
306
SiemensHalske DynamoElectric Machines for Electric Illumination and Galvanic Deposition
311
Siemens Halskes DynamoElectric Machines for Purifying Metals
318
Hochhausens and Edisons Machines for the same uses
321
Maxims Machine
346
The Edison DynamoElectric Machines
348
Jurgensens Machine
367
Westons CentralMagnet Machine
369
Westons StationaryArmature Machine
375
SECTION PAGE 75 The WallaceFarmer Light Machine 882
384
HefnerAltenecks Latest DynamoElectric Machine
390
Arago DiskArmature Dynamo
396
PART VI
400
Lontins AlternatingCurrent Machines
401
Grammes Machine for Alternating Currents
405
The Jablochkoff Machine for Alternating Currents
414
Siemens Halskcs AlternatingCurrent Machine
416
The LevettMuller Machine
422
The Lachaussee Machine
424
Gordons AlternatingCurrent Machine
426
The FerrantiThomson AlternatingCurrent Machine 483
437
Niaudets MagnetoElectric Machine 380
445
Hochhausens Disk Machines
451
The Elphinstone and Vincent Machine
454
The Unipolar Machine
455
PART VII
458
Proportions for DynamoElectric Equilibrium
459
Testing the Equation of Equilibrium
461
Deduction from the Main Equation
464
Dependence of the Effective Magnetism on Strength of Current
467
Comparison of DynamoElectric with MagnetoElectric Machines
471
Marcel Deprezs Characteristic Curve
475
The Theory of Dynamo Machines
477
Machines with Separated Currents
479
Dynamo Machines of Constant Electromotive Force
481
Combination or Compound Machines
483
Collectors
501
Register of Rotations 74
518
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Page 137 - If now, while the circuit of the armature remains completed, the rheomotor be removed from the electro-magnet, on causing the armature to revolve, however rapidly, it will be found by the interposition of a galvanometer, or any other test, that but very slight effects take place. Though these...
Page 136 - I have employed. The construction, it will be seen, is the same as that of the electro-magnetic part of Mr. Wilde's machine. The core of the electro-magnet is formed of a plate of soft iron 15 inches in length and ^ an inch in breadth, bent at the middle of its length into a horseshoe form.
Page 139 - On bringing the primary coil of an inductorium (Ruhmkorff's coil) into the circuit formed by connecting the coils of the electro-magnet and rotating armature, no spark occurs in the secondary coil. On account of the great resistance of the circuit, which now also includes the primary coil of the inductorium, the current is not in sufficient quantity to produce any noticeable inductive effect.
Page 139 - A very remarkable increase of all the effects, accompanied by a diminution in the resistance of the machine, is observed when a cross wire is placed so as to divert a great portion of the current from the electro-magnet.
Page 137 - ... 0067 in diameter, by its making a powerful electromagnet, by its decomposing water, and by other tests. The explanation of these effects is as follows: — The electromagnet always retains a slight residual magnetism, and is therefore in the condition of a weak permanent magnet ; the motion of the armature occasions feeble currents in alternate directions in the coils thereof, which, after being reduced to the same direction, pass into the coil of the electromagnet in such...
Page 136 - The magneto-electric machines which have been hitherto described are actuated either by a permanent magnet or by an electro-magnet deriving its power from a rheomotor placed in the circuit of its coil. In the present note I intend to show that an electro-magnet, if it possess at the commencement the slightest polarity, may become a powerful magnet by the gradually augmenting currents which itself originates.
Page 139 - ... but immediately afterwards the glow disappeared, and only about one inch of the wire could be permanently kept at a red heat. This diminution of effect was accompanied by a great increase of the resistance of the machine. The cause of the momentary strong effect was, that the machine from its acquired momentum continued its motion for a few seconds, though it required a stronger force than could be applied to maintain that motion. Each time the circuit is broken and recompleted, the same effect...
Page 135 - ... it is not even necessary to give any external impulse upon restarting the machine, the residuary magnetism of the electro-magnetic arrangements employed being found sufficient for that purpose. "The mechanical arrangement best suited for the production of these currents is that originally prepared by Dr. Werner Siemens, in 1857...

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