Pair of compasses with two arms joined at one end - has pin-pointing arm with guide member coupled to holder by guide rod

摘要

One compass arm, i.e. the pin-pointing one (3), has a fin expansion (4) while the drawing arm (5) has a drawing extension (6) both at the respective free arm ends. The drawing extension has a universal holder (10) for drawing implements. The pin-point arm has a guide member (9). A guide rod (12) connects the guide member and the universal holder. It is swivelably mounted at both guide member and holder, parallel to the plane of both arms. At least the free end (14) of the guide rod is outwardly slidable beyond the guide member and/or the holder, with an arresting facility at both. ADVANTAGE - Increased stability and drawing precision.