| 释义 |
electromagnet|ɪˌlɛktrəʊˈmægnɪt|
Also with hyphen.
[f. electro- + magnet.]
A piece of soft iron surrounded by a coil of wire, through which a current of electricity may be passed, rendering the iron temporarily magnetic.
1831Amer. Jrnl. Sci. XX. 201 Account of a large Electro-magnet. 1832W. Sturgeon in Phil. Mag. XI. 194 On Electro-magnets. c1865J. Wylde in Circ. Sc. I. 250/2 A horse-shoe electro-magnet. 1879G. B. Prescott Sp. Telephone Introd. 2 The first simple electro-magnet was made by Sturgeon [of Manchester].
Hence eˌlectromagˈnetic, -magˈnetical adjs., pertaining to electromagnetism. eˌlectromagˈnetically adv., by means of electromagnetism. eˌlectromagˈnetics, the science of electromagnetism. eˌlectroˈmagnetism, the phenomena of the production of magnetism by the electric current; also, the influence of a magnet on the electric current.
1821Faraday Diary 3 Sept. (1932) I. 49 Electro-magnetic expts. with Hare's Calorimotor. 1823J. Badcock Dom. Amusem. 126 The electro-magnetic influence always increased with the number of the plates. 1837Ann. Electr., Magn., & Chem. I. 387 We need scarcely despair of seeing the electro-magnetic telegraph established for regular communication from one town to another. 1879G. B. Prescott Sp. Telephone Introd. 2 An electro-magnetic telegraph. 1905Harmsworth Encycl. III. 2174/3 It was shown by Clerk Maxwell that a repeated electrical or magnetic disturbance or change would set up and radiate waves of an electro-magnetic nature in the ether, and that, with certain assumptions concerning the ether, these waves would travel with the velocity of light. Upon this is based his electro-magnetic theory of light. 1908Chem. Abstr. 372 Calculation of the resistance of a wire when reflecting electro-magnetic waves. 1929E. Mallett Telegr. & Teleph. xi. 281 Whenever an electric current changes in a circuit, energy in the form of electromagnetic waves is radiated away from the circuit. 1937J. E. Shrader Physics for Students lv. 539 (caption) The electromagnetic spectrum. 1955Gloss. Terms Radiology (B.S.I.) 10 Electromagnetic radiation, radiation associated with a periodically varying electric and magnetic field. 1957Technology Mar. 13/1 The common feature of these new electromagnetic pumps is that, instead of using electromagnetic forces to cause solid metal to rotate, they use these forces to drive liquid metal under pressure along a pipe. 1965M. Garbuny Optical Physics i. 2 Altogether, it is now known that the electromagnetic spectrum..encompasses radio- and microwaves, infrared, visible, and ultraviolet light, x (or Roentgen-) rays, gamma, and cosmic radiation. 1823J. Badcock Dom. Amusem. 126 Electro-magnetical effects. 1881Sir W. Thomson in Nature XXIV. 435 To transmit electro-magnetically the work of waterfalls. 1828F. Watkins (title) Popular Sketches of Electro-Magnetism. 1830Sir J. Herschel Stud. Nat. Phil. 94 Oërsted's great discovery of electro-magnetism. 1879G. B. Prescott Sp. Telephone 5 Reproducing tones by electro-magnetism. |