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单词 offset staff
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offset staff
offset staff n. Surveying a rod used in measuring offsets.
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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.
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