| 单词 | beam-compass | 
| 释义 | > as lemmasbeam-compass   beam-compass  n. an instrument consisting of a wooden or brass beam with sliding sockets, for drawing larger circles than an ordinary pair of compasses can describe. ΘΚΠ society > communication > representation > a plastic or graphic representation > graphic representation > drawing plans or diagrams > 			[noun]		 > drawing instruments > for circles compassa1387 shank1587 beam-compass1785 bow-compass1796 bow-pen1869 pencil arm1884 spring bow1998 1785    W. Roy in  Philos. Trans. 		(Royal Soc.)	 75 402  				A beam-compass, sufficient to take in twenty feet. < as lemmas | 
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