| 释义 |
ˌmake-and-ˈbreak
Also without hyphens.
[f. the vbs. as used in to make contact (make v.1 8), to break contact (break v. 29): see contact 1 c.]
a. The alternate making and breaking of electrical contact. Freq. attrib.
1857Chambers's Jrnl. 22 Aug. 121/1 The transmission of the current having..to be made through a make and break key of metal. 1875F. Guthrie Magn. & Electr. §235 The automatic make and break. 1898Engin. Mag. XVI. 120/2 The interruptions corresponding to the make and break of a telegraph key. 1904A. B. F. Young Compl. Motorist (ed. 2) 197 The time of firing is controlled by a simple ‘make-and-break’ commutator placed on the half-time shaft. 1911Encycl. Brit. XXVI. 520/2 In Squier and Crehore's ‘Synchronograph’ system ‘sine waves’ of current, instead of sharp ‘makes and breaks’,..are employed for transmitting signals. 1938Archit. Rev. LXXXIII. p. lviii, A semi-rotary quick make-and-break switch. 1958Newnes Compl. Amat. Photogr. 120 To charge a large capacitor from accumulators requires a more complex power pack which includes a make-and-break coil, transformer and rectifier.
b. An apparatus for automatically making and breaking electrical contact.
1908Daily Chron. 7 Nov. 3/3 The ‘make and break’ or commutator..is..frequently placed in an inaccessible position. 1911A. B. Smith Mod. Amer. Telephony xxv. 689 The circuit consisted of an induction coil..and mechanical ‘make and break’ that gave 10,000 sparks per second. 1929Times 5 Nov. 7/5 The distributor and make-and-break are easily seen. 1970K. Ball Fiat 600, 600D Autobook xi. 138/2 Failure of the horn to operate may be due to..dirty contacts on the horn make-and-break. |