| 单词 | levelling staff |
| 释义 | > as lemmaslevelling staff levelling staff n. an instrument, consisting essentially of a graduated pole with a vane sliding upon it, used in levelling. ΚΠ 1728 E. Chambers Cycl. at Levelling Levelling Staffs are Instruments used in Levelling, serving to carry the Marks to be observ'd, and at the same time to measure the Height of those Marks from the Ground. < as lemmas |
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