| 单词 | rafter level |
| 释义 | > as lemmasrafter level rafter level n. U.S. (now historical) a levelling instrument consisting of an A-frame made of long spars of wood with a pendulum suspended from the apex, used to ascertain the differences of level in a piece of land. ΚΠ 1786 G. Washington Diary 14 Aug. (1979) V. 27 After..levelling part of the ground (with a Rafter level) along which the Ditch was to be cut I intended to have run a course or two of Fencing. 1817 T. Jefferson Let. 2 May in Writings (1984) 1406 Our practice is when we first enter on this process [sc. horizontal ploughing], with a rafter level of 10 f. span, to lay off guide lines conducted horizontally around the hill or valley. 1939 H. H. Bennett Soil Conservation xl. 876 In laying off the furrows around the hill, the rafter level was used every 30 or 40 yards. 2003 L. Stanton in J. Hartz Siting Jefferson 35 One January day Jefferson observed a fourteen-year-old slave laying down the guidelines for a plowman with a rafter level. < as lemmas |
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