Pair of compasses geodetical triangle - has versatile circle markings by holes of 2 mm dia. in geodetical triangle

摘要

Circles of R 5 to R 103 mm, and of R 105 to 155 mm can be marked by holes of 2 mm in dia. in the geodetical triangle by a setting needle with tip of 45 deg.. The setting needle is 2.4 mm long and is secured in left-hand corner of 45 deg. on a leaf spring and on a pusher. The triangle is made of clear plastics, such as Plexiglass (RTM) and is 90 mm wide, 180 mm long, and 2 mm thick.