| 单词 | post-office bridge |
| 释义 | > as lemmaspost-office bridge post-office bridge n. a portable, self-contained form of Wheatstone bridge containing a large number of electrical resistors which are selected by means of plugs. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > resistance > [noun] > instrument used in measuring > in form of bridge bridge1865 Wheatstone bridge1865 wire bridge1880 post-office bridge1890 post office box1894 Kelvin double bridge1896 Maxwell bridge1907 1890 Proc. Royal Soc. 48 508 The resistance used in the Post office bridge was about 200 ohms, while that of the main circuit was about 10 ohms, so that the amount of current shunted was comparatively small. 1931 W. L. Upson Electr. Lab. Stud. iii. 45 There is a second form of Wheatstone bridge known as the ‘post-office bridge’. In this type there is no wire giving wide variability to the ratio of B to A, but there are fixed resistance coils so that the ratio may be made 1 to 1, 1 to 10, [etc.]. < as lemmas |
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