The Electrical EngineerBiggs & Company, 1892 |
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Страница 113 - FELKIN, HM— Technical Education in a Saxon Town. Published for the City and Guilds of London Institute for the Advancement of Technical Education.
Страница 104 - Four pairs of weights (sliding and counterpoise), of which the sledge and its counterpoise constitute the first pair, are supplied with each instrument. These weights are adjusted in the ratios of 1 : 4 16 : 64, so that each pair gives a round number of amperes, or half-amperes, or quarter-amperes, or of decimal subdivisions or multiples of those magnitudes of current on the inspectional scale.
Страница 43 - Canst thou lift up thy voice to the clouds, That abundance of waters may cover thee? Canst thou send lightnings, that they may go, And say unto thee, Here we are?
Страница 350 - The currents in the fixed coils around the magnets are not the only magnetising forces applied in a dynamo machine ; the currents in the moving coils of the armature have also their effect on the resultant field. There are in general two independent variables in a dynamo machine, the current around the magnets and the current in the armature, and the relation of EMF to currents >s fully represented by a surface.
Страница 193 - POCKET LOGARITHMS, to Four Places of Decimals, including Logarithms of Numbers, and Logarithmic Sines and Tangents to Single Minutes. To which is added a Table of Natural Sines, Tangents and Co-tangents. 16mo, boards 50 POPE FL Modern Practice of the Electric Telegraph. A Technical Handbook for Electricians, Managers and Operators.
Страница 114 - It is not yet a decade since the contempt felt by the devotees of pure science for those who seek to put her truths to some use, was expressed before this section. Even within the past year, among discussions of educational policy, we find this statement, — "We may claim it as a distinction, that, in the seats of academic learning, little or nothing useful is taught :" and again, — "Greek is useless ; but its uselessness is the very strongest reason for its being a compulsory subject in the University...
Страница 100 - Edison in the specifications of his patent application, "that if sufficient elevation be obtained to overcome the curvature of the earth's surface and to reduce to the minimum the earth's absorption, electric telegraphing or signaling between distant points can be carried on by induction without the use of wires connecting such distant points.
Страница 230 - in series ' — that is to say, the positive pole of one to the negative pole of the next.
Страница 350 - ... and having their upper extremities connected by a yoke of rectangular section. Each limb, together with its pole-piece, is formed of a single forging of wrought iron. These forgings, as also that for the yoke, are built up of hammered scrap and afterwards carefully annealed, and have a magnetic permeability but little inferior to the best Swedish charcoal iron. The yoke is held to the limbs by two bolts, the surfaces of contact being truly planed.
Страница 350 - ... on pages 84 to 121 of this volume. The magnetizing coils on each limb consist of sixteen layers of copper wire 2 mms. in diameter, making a total of 3,968 convolutions for each machine. The pole-pieces are bored out to receive the armature, leaving a gap above and below subtending an angle of 68° at the centre of the shaft. The opposing surfaces of the gap are 1"4 cm. deep. The following table gives the leading dimensions of the machine : — cms. Length of magnet limb...