Abstract: A ruler system for measuring workpieces includes a multi-surfaced ruler with rules inscribed along the edges of several surfaces. The ruler contains grooves and T-slots in its surfaces that run along the length of the ruler. In addition, apertures are located in the end surfaces of the ruler. The T-slots and apertures allow several accessories to be attached to the ruler for additional functionality. The accessories include a wheel attachment for drawing parallel lines, storyboard indicators for repeated measurements, a hook rule for measuring from the end of a workpiece, and trammel points for drawing arcs and circles. Connectors may be placed in the grooves of the ruler to link together multiple rulers.

Abstract: A tool for accurately determining and setting angles using an x beam and a y beam that pivot about a common axis and may be locked in position relative to each other with an axle lock and by locking one leg of each beam to a slotted stabilizer bar. Index holes on the x beam and the y beam receive movable index pins between which measurements are taken. Trigonometric calculation may be used, or a precalculated reference book or data table may be consulted, to determine or set the angle between the x and y beams for various index pins separations, when the pins are located in the various combinations of x and y beam holes. Relatively course linear measurements permit very fine angular measurements and settings.