AN IMPROVEMENT OF ANGLE MEASURING GEOMETRICAL PROTRACTOR INSTRUMENT

摘要

PROTRACTOR (Angle measuring geometrical instrument) Existing protractor(s) carries demerits of - the confusion of double scale, inaccuracy in placing the instrument at exact location and reading or marking the degree precisely. The new design is a two side use instrument having two degree scales one on each side. Side-1 for measuring right-to-left angles (figure-2) and side-2 for measuring left-to-right angles (figure-3). The origin 4 is placed on the origin of the diagram on the paper. The baseline 6 helps to coincide the instrument precisely with the diagram. The pores 7 help to mark the angle. The scale 10 reads the degree in whole number.