Graphical instrument e.g. compass, forming device, has branch carrying measuring scale that marks position of index of slider, and measuring radius or arc of circle based on measurement of position of slider that carries marking unit

摘要

The device has a branch (2) receiving a tip (3). Another branch (4) receiving a pencil or pen type marking unit (6). The branch (4) carries a slider (9) and a measuring scale (10) that marks position of an index of the slider. The branch (4) measures radius or arc of circle based on measurement of the position of the slider that carries the unit.