Rotagram, class set of 20 Posters so that bearings can be

so that bearings can be measured in a clockwise direction

as well as stencil shapes for sketching in 3-D and for 2-D patterns

Mathomat is a complete technical drawing set in a single instrument combining protractor

Proliner supplied separately

Ratios: 1: 12

Rotagram, class set of 20 Posters so that bearings can beThe Rotagram is a simple, and highly effective, dynamic protractor design which asks students to measure angle by rotating its movable arm, after locating its vertex over the target angle. Angle is a difficult and complex topic for many students. As a result students frequently enter secondary school without a full understanding of angle. A common problem for students is that they often develop two different sets of concepts for angle, one static and