Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: May 26, 2025
Of course in a dynamo-electric generator the stronger the magnetic field, the less the resistance of the conductor, and the faster it is moved across the lines of force, that is to say, the more lines it cuts in a second the stronger is the current produced. Similarly in an electric motor, the stronger the current and magnetic field the faster will the conductor move.
The announcement of Siemens and Wheatstone came at an apter time than Hjorth's, and was more conspicuously made. Above all, in the affluent and enterprising hands of the brothers Siemens, it was not suffered to lie sterile, and the Siemens dynamo-electric machine was its offspring.
These wires are connected with the brushes of a commutator, K, on the engine-shaft, which commutator is in electrical connection with the poles of a battery, dynamo-electric machine, or other source of electricity. Instead of two wires to produce a spark, a single wire may be arranged to become incandescent at the proper time for ignition.
In order to obtain this desirable knowledge, the author considers that the three following points should form the aim of experimentalists: First, the determination of the efficiency, K, of the principal kinds of magneto-electric, or dynamo-electric machines working as generators; second, the determination of the efficiency, K1, of the same machines working as motors; third, the determination of the law according to which the magnetism of the cores of these machines varies with the intensity of the current.
The marvellous activity in the electric arts and sciences, which followed as a natural result of Faraday giving to the world in the dynamo-electric machine a cheap electric source, naturally leads to the inquiry as to whether at a somewhat later day a yet greater revolution may not follow the production of a still cheaper electric source.
It seems almost incredible that only a little over thirty years ago the sum of scientific knowledge in regard to dynamo-electric machines was so meagre that the experts of the period should settle upon such a dictum as this, but such was the fact, as will presently appear.
These patents may be roughly tabulated as follows: Incandescent lamps and their manufacture....................149 Distributing systems and their control and regulation....... 77 Dynamo-electric machines and accessories....................106 Minor parts, such as sockets, switches, safety catches, meters, underground conductors and parts, etc............... 43
It might naturally be expected that the essential facts of Edison's work would appear on the face of his numerous patents on dynamo-electric machinery, but such is not necessarily the case, unless they are carefully studied in the light of the state of the art as it existed at the time.
Friction has nothing to do with the matter. The old-fashioned spark-producing "electrical machine" of our youthful days, in which a glass cylinder or disk was rotated by a handle while a rubber of silk pressed against it, has nothing in common with the dynamo-electric generator, except that in both something turns upon an axis as a grindstone or the barrel of a barrel-organ may do.
Pioneers of Electricity. By J. Munro. Dynamo-Electric Machinery. By Silvanus P. Thompson. A Dictionary of Electrical Words, Terms, and Phrases. By Edwin J. Houston. Electricity and Magnetism. By Edwin J. Houston. Electricity One Hundred Years Ago and To-Day. By Edwin J. Houston. Magnetism; Electro-Technical Series. By Edwin J. Houston and Arthur E. Kennelly. Electro-Dynamic Machinery.
Word Of The Day
Others Looking