Thursday, January 10, 2008

Protractor


Various forms are still in use at school. The most used one provides 180°. I still have one with 400g for the full circle (and I also have trigonometric tables for these 'neugrad' or 'new gradation' which allows more easy mathematical handling of arcs).
For military use 'artillery' versions with 6400 units for the full circle were available (at least in Switzerland).

No comments: