| 单词 | hook gauge |
| 释义 | > as lemmashook gauge hook gauge n. an instrument for accurately determining the surface level of water and consisting of a hook and pointer attached to a fixed vernier, the hook being brought up until its tip just pierces the surface of the water. ΘΚΠ the world > relative properties > measurement > measuring instrument > [noun] > for measuring depth > of any water sounding-board1776 hook gauge1875 1875 Jrnl. Franklin Inst. 99 250 The depth on the weir was observed by means of a hook-gauge. 1880 Encycl. Brit. XII. 477/2 The hook gauge used first by Mr. U. Boyden of Boston, in 1840. 1934 H. Addison Text Bk. Appl. Hydraulics xv. 304 Hook and point gauges. These are the simplest and most reliable gauges for measuring ranges of head not exceeding about 3 ft. (60 cms.) with a probable error of 1/1500 ft. (0·2 mm.). < as lemmas |
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