| 单词 | end standard |
| 释义 | > as lemmasend standard end standard n. Metrology a standard of length in the form of a metal bar or block whose end faces are the standard distance apart under specified conditions; cf. line standard n. a. ΘΚΠ the world > relative properties > measurement > measurement of length > [noun] > standard of length end standard1888 line standard1888 1888 Encycl. Brit. XXIV. 478/1 Standards of length are of two types, the defining points being either at a certain part of two parallel lines engraven in one plane (a line-standard), or else points on two parallel surfaces, which can only be observed by contact (an end-standard). 1906 W. Hallock & H. T. Wade Outl. Evol. Weights & Meas. x. 223 The line standard, of course, can be used with a microscope with cross-hairs, or a micrometer microscope, much more readily than an end standard. 1975 G. Bram & C. Downs Manuf. Technol. i. 7 With few exceptions to the rule, most engineering devices depend upon end standards. < as lemmas |
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