Set square for use during manual drawing of straight line, has parts movable relative to one other such that parts provide breadths in different directions relative to set square, where one of breadths corresponds to one-third of length

摘要

The set square (201) has a pair of parts movable relative to one another in such a manner that the parts provide two breadths in different directions relative to the set square, where one of the breadth corresponds to one-third of length, and the other breadth is smaller than one-third of the length. The parts are stabilized to one another by a snatching mechanism, where one of the parts is designed in a trapezium shape, and the other part is designed in the form of a right-angled isosceles triangle.