Electric Lighting and Power Distribution: An Elementary Manual on Electrical Engineering, Suitable for Students Preparing for the Preliminary and Ordinary Grade Examinations of the City and Guilds of London Institute, Том 1

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Fall of Potential
58
Hydraulic analogue illustrating Fall of Potential
59
Magnetic Field due to a Direct Current in a Straight Con ductor
60
11 Righthand Rule for finding the + direction round the Magnetic Field of a Straight Conductor carrying a Direct Current
62
3
63
14 Righthand Rule for finding the direction of deflection
64
of a Magnetic Needle by a Direct Current
65
Magnetic Field of a Bar Magnet
66
Magnetic Field of a Solenoid
67
Simple Bar ElectroMagnet
68
StraightWire ElectroMagnet
70
Attractive Force of a Solenoid
71
Three kinds of Horseshoe ElectroMagnet
72
Horseshoe ElectroMagnet with one Coil on Yoke
73
Annular Ironclad ElectroMagnet
74
Righthand Rule for finding the Polarity of a Solenoid or ElectroMagnet
75
Clockface Rule for determining the Polarity of a Solenoid or ElectroMagnet e s
76
CHAPTER IV
81
119
82
Attraction and Repulsion of Currents
95
The Leclanché and similar Cells 71
99
125A
126
134
134
CHAPTER VI
142
S9 The Wheatstone Bridge
199
Potentiometer method of measuring E M F or P D
207
Needles and Mirror of Reflecting Galvanometer
213
Conductor Resistance
225
Cardew Voltmeter interior
234
Contact Rod
240
Multicellular Woltmeter
249
Swinburnes Nºtype Voltmeter interior
255
Winding for Alternating Currents
264
Spring of Ayrton and Perrys Instruments Enlarged Needle and Magnet of Phoenix Instruments
266
137 Phoenix Ammeter and Voltmeter
267
Simple Gravity Ammeter 139 Action of Holden Drake and Gorham Instruments
269
Holden Drake and Gorham Ammeter
270
Armature and Needle of Schuckert Instruments
271
Schuckert Voltmeter 143 Walsall Relay Woltmeter
274
Plug of Walsall Instruments 145 Plug of Walsall Instruments Section
275
Action of Walsall Instruments
276
146A Davies Muirhead Woltmeter
277
Recording Voltmeter
295
Recording Ammeter
296
11
299
CHAPTER VIII
304
Iron Core of Shuttle Armature
313
Fourpart Ring Armature
314
164 Parts of Joel Ring Armature
315
Armature CorePiate and Spider 166 Drum Armature
317
CorePlate of Drum A1 mature 168 Lamination of Armature Core
321
Field Magnets of SingleMagnet Dynamos 170 Consequent Poles
324
FIG PAGE 171 Field Magnets of DoubleMagnet Dynamos
325
Field Magnets of FourPole Dynamos
326
Field Magnets of Four and SixPole Dynamos
327
Excitation of Dynamos
330
Magnetic Field of TwoPole Dynamo with Ring or Cylinder Armature
332
Circulation of Current in a Ring Armature
333
Analogue illustrating the Circulation of Current in a Ring Armature
335
Distortion of Dynamo Field
336
Back view of simple Drum Armature
337
Connectors of Drum Armature
339
Crossconnection of FourPole Armature
341
Simple OpenCoil Drum Armature
342
OpenCoil Ring Armature
343
Construction of Commutators
344
Rocker and BrushHolders
346
Crompton Rocker and BrushHolders
349
187A Directthrust BrushHolders
351
Different kinds of Brushes 189 Gauze Brush
353
Carbon Brushes
354
Overtype Kapp Machine
361
Undertype Kapp Machine and Engine combined 193 Manchester Machine
362
EdisonHopkinson Machine
365
Siemens Machine
366
Goolden Machine
368
Longitudinal Section facing 198 Norwich Dtype Machine
369
Section of Norwich D type Machin 200 Pedestal Bearing and Lubricator 201 Parker Machine
372
Armature Coil of Parker Machine
374
Armature of Parker Machine 204 Tyne 2Pole Machine
375
Joel Machine
377
Crompton Machine Side view
378
INDEX to Vol I
417
249

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Сторінка xxi - MASS AND WEIGHT.— The mass of a body is the quantity of matter in it ; the weight of a body is due to the force of gravity acting upon this matter.
Сторінка 14 - DIFFERENCE BETWEEN ENERGY, FORCE, WORK AND POWER.— It is important that the student should thoroughly understand the meaning of the above terms. Energy is the capacity to do work. Force is one of the factors of work and has to be exerted through a distance to do work, the work being reckoned as the product of the force and the distance through which it has been applied. Work is done when energy is expended or when force overcomes a resistance. Power is the rate of working.
Сторінка 319 - ... sides of the iron cylinder, and the armature back to the iron core, from which they started. 38. Differentially Wound Magnet. — The winding and construction of the extra magnet is the distinctive feature of this repeater. There are two coils of the same number of turns and resistance on the magnet. The end of one coil and the beginning of the next are joined together and connected to a binding post on the base of the instrument. In Fig. 14 is shown an iron core over which two coils are wound...
Сторінка 149 - The current flowing in the coils of wire on the magnet produces what is called a " magnetomotive force," which is proportional to the current and to the number of turns of wire ; and a certain fraction of this quantity is used to send the magnetism through the iron rod and the remainder to send it through the air, or, in other words, every little piece of the magnetic circuit requires a certain magnetomotive force to drive the magnetism through it, and the sum of all these...
Сторінка 64 - FiG 133 that the sense of the field is reversed with reversal of the current, while the direction of the field remains the same. These experimental results may be expressed by the following rule : Grasp the wire with the right hand, the outstretched thumb pointing in the direction of the current; then the fingers indicate the sense of the lines of magnetic induction / \ / \ (Fig. 133). / \ / \ This relation may ® ' °© also be expressed \ / \ / by conceiving the \ / \ / current to be flow- ., ,....
Сторінка 189 - to the passage of an unvarying electrical current, when the coil of insulated wire forming part of the aforesaid instrument and connected to the aforesaid terminals is in all parts at a temperature of 15°'4 C.
Сторінка 190 - Verified, 1894 and 1909,' when on reversing the current in the fixed coils the change in the forces acting upon the suspended coil in its sighted position is exactly balanced by the force exerted by gravity in Westminster upon the iridioplatinum weight marked A and forming part of the said instrument.
Сторінка 226 - Reaistance.) fixed at right angles. A controlling magnet fitted on the left-hand side of the box (Fig. 107), serves to increase or diminish the sensitiveness of the galvanometer. When the magnet's N. pole is uppermost, the galv. will be most sensitive ; if the S. pole is at the top, the deflection of the needle due to any given current will be diminished to nearly one-half. Fig. 109 is a repetition of Fig. 108, except that all those portions of the apparatus not used for the first test (conductor...
Сторінка 23 - CONDUCTIVITY AND RESISTIVITY. The resistivity or specific resistance of a substance is the resistance between opposite faces of a centimetre cube (unit volume) of the substance, expressed in microhms The conductivity or specific conductance of a substance is the reciprocal or opposite of its resistivity, and therefore may be expressed in megamhos, for 1 microhm = 1 mega mho (§ 22).

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