| 单词 | offset staff |
| 释义 | > as lemmasoffset staff offset staff n. Surveying a rod used in measuring offsets. ΘΚΠ the world > the earth > earth sciences > geography > map-making > surveying > [noun] > surveying instruments > staff or pole > for taking off-sets station staff1653 cross1669 station pole1775 offset staffc1791 station rod1791 cross-staff1874 c1791 Encycl. Brit. VII. 679/1 The distances taken by the off-set staff, on either side of the station-line, are to be entered into columns on either side of the middle column. 1807 C. Hutton Course Math. (ed. 5) II. 57 An offset-staff..for measuring the offsets and other short distances. It is 10 links in length, being divided and marked at each of the 10 links. 1949 T. W. Birch Maps iv. 33 Before the chain is moved forward each time, he takes his offset staff and measures the distance of the fence from the chain, at right angles to the latter, at significant points which will enable him to make a fairly accurate plan of the fence. 2003 www.orbitals.com 29 Jan. (O.E.D. Archive) An offset staff is 6 feet 7.2 inches. The staff is divided into ten links using alternating stripes of paint. < as lemmas |
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