| 单词 | proof staff |
| 释义 | > as lemmasproof staff proof staff n. now rare a metal straight edge for testing or adjusting a wooden staff. ΚΠ 1842 Times 28 Oct. 8 Building materials, brass and ironmongery,..copper piping, spring steel, iron, proof staff, corn or malt mill, [etc.]. a1877 E. H. Knight Pract. Dict. Mech. II. 1808/1 Proof-staff, a metallic straight edge by which a wooden staff is tested and corrected. 1954 R. Wailes Eng. Windmill 206 The proof staff is a long narrow cast-iron surface plate mounted in a wooden case with a hinged cover. The usual size is about four feet wide and its purpose is to test the accuracy of the wooden paint staff. < as lemmas |
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