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plumb-rule
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plumb-rule
plumb-rule (ˈplʌmruːl) [f. plumb n. + rule n.] An instrument used by builders, masons, carpenters, etc., for ensuring or testing the verticality of an erection; consisting of a plummet and line attached to and swinging freely on the surface of a narrow straight-edged board, marked with a longitudina...
Oxford English Dictionary
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plumb-line
plumb-line, n. (ˈplʌmlaɪn) Also 7 plim-. 1. A line or cord having at one end a metal bob or plummet, for testing or determining vertical direction; sometimes = plumb-rule.1538 Elyot Dict. Perpendiculum, a plumlyne, such as masons and carpenters haue, with leadde at the ende. 1609 Bible (Douay) Isa. ...
Oxford English Dictionary
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List of timber framing tools
Combination square
A Plumb-bob on a string is sometimes used with a plumb-rule or plumb-square to measure vertical or horizontal and to transfer marks
wikipedia.org
en.wikipedia.org
perpendicular
perpendicular, a., adv., and n. (pɜːpənˈdɪkjʊlə(r)) Also 6 -pent-. [a. OF. perpendiculer, -ier, = Sp. perpendicular, It. perpendicolare, ad. L. perpendiculār-is, f. perpendicul-um: see prec. and -ar1. Mod.F. has the parallel form perpendiculaire, ad. L. perpendiculārius (both forms in Frontinus 1st ...
Oxford English Dictionary
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