RULE FOR PROPORTIONAL DIVIDING OF ANGLES Russian patent published in 1996 - IPC

FIELD: measuring instruments. SUBSTANCE: rule has longitudinal axial line marked at the same distance from working edges and additional longitudinal axial line arranged at the same distance from longitudinal axial line and one of the edges. The rule is made of a transparent material and is rectangular. The rule can be provided with the second additional axial line arranged at the same distance from the first additional longitudinal axial line and edge. The longitudinal axial lines allow an angle to be divided into three equal parts. EFFECT: improved accuracy. 2 cl, 10 dwg