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单词 bifilar
释义

bifilaradj.

/bʌɪˈfʌɪlə/
Etymology: < bi- comb. form 1a + filar adj., < Latin fīlum thread + -ar suffix1.
Fitted or furnished with two threads; spec. applied to apparatus for measuring minute distances or angles; also for suspending a body so that it has a very slight directive force in a definite plane, with a view to the measurement of minute forces, etc. Also as n.
ΘΚΠ
the world > relative properties > measurement > measuring instrument > [adjective] > relating to a micrometer or micrometry > attributes of micrometer
bifilar1839
1836 W. S. Harris in Trans. Royal Soc. CXXVI. 417 A new species of balance; it may be termed, from the peculiar mechanical principle on which it depends, a bifile balance.]
1839 W. Whewell Let. 17 Jan. in I. Todhunter William Whewell (1876) II. 275 Airy has just put up his Gaussian apparatus..at Greenwich, including a Bifilar.
1846 Penny Cycl. Suppl. II. 256/1 The horizontal force magnetometer at the Greenwich Observatory is bifilar.
1848 W. S. Harris Rudim. Electr. iii. 83 The Bifilar Balance. In this electrometer..a re-active force is obtained by means of a lever at the extremity of two parallel and vertical threads of unspun silk.
1866 R. M. Ferguson Electricity 26 Gauss's Bifilar Magnetometer.
1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §435 The Bifilar Suspension..was used also by Gauss in his bifilar magnetometer for measuring the horizontal component of the terrestrial magnetic force.

Derivatives

biˈfilarly adv. in a bifilar manner, by means of two threads.
ΘΚΠ
the world > textiles and clothing > textiles > thread or yarn > [adverb] > by means of two threads
bifilarly1884
1884 Harper's Mag. Sept. 644/1 A copper disc suspended bifilarly.
This entry has not yet been fully updated (first published 1887; most recently modified version published online June 2018).
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adj.1839
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