parallel motion protractor

parallel motion protractor

[′par·ə‚lel ¦mō·shən ′prō‚trak·tər]
(graphic arts)
An instrument consisting essentially of a protractor and one or more arms attached to a parallel motion device, so that the movement of the arms is everywhere parallel; the protractor can be rotated and set at any position so that it can be oriented to a chart. Also known as drafting machine.
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