An instrument primarily used in drafting, consisting of two joined arms, one end being secured to a stationary surface and the other end equipped with an adjustable protractor and removable ruled scale(s); or two rigid beams, one beam anchored across full length of top of drawing board, the other beam perpendicular to top beam equipped with adjustable protractor and removable ruled scale(s). It is used as a guide for drawing parallel lines at any angle on a chart or drawing, or transmitting reference points.
Classification: Drafting tables and machines, whether or not automatic
NSN 5950-01-012-1906
NSN 5999-00-728-2440
NSN 5999-01-567-7236
NSN 6645-00-004-8628
NSN 5990-01-012-0613
NSN 6145-01-442-6064
NSN 5835-01-357-9235
NSN 5905-01-534-4955
NSN 5990-01-400-3299
NSN 6320-01-176-8367
NSN 5985-01-055-9698
NSN 6135-01-177-3552