beam compass


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beam compass

n
(Tools) an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide. Also called: trammel
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If there were ever a place in New York to find such items as an artificial horizon, beam compass, hand cast brass ship bells with iron cast clappers, books, charts, boat-swains' whistles, maps and foghorns, it is New York Nautical," explains Ms.