| 单词 | jackknife switch |
| 释义 | > as lemmasjackknife switch jackknife switch n. now historical and rare (in a telephone switchboard) a switch (switch n. 3b) consisting of a circular socket designed to accommodate a plug having a single pin with two or more contacts along its length and a lateral groove between the tip and the shaft; = Jack n.2 18a. ΚΠ 1880 Sci. Amer. 10 Jan. 21/1 Each person having the use of a telephone connected with the central office is called a subscriber, and his wire entering the office is connected with a small switch—a jack-knife switch. 1976 Proc. IEE 123 561/2 It was here that the ‘jack-knife’ switch, forerunner of the well-known ‘jack’, was introduced. 2009 C. Platt Make: Electronics ii. 49 In 1878, Charles E. Scribner..developed the ‘jack-knife switch’, so called because the part of it that the operator held looked like the handle of a jackknife. < as lemmas |
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