Compass No. 403

The Compass No. 403 is another of the shorter slide rules in the collection. It’s a basic beginner’s slide rule made of bamboo with the scales printed on a plastic veneer. The cursor is also a magnifier which helps to see the small printing on the slide rule. One edge of the slide rule is beveled and has inch and cm ruler markings.

Compass No. 43 slide rule showing the A/B/CI/C/D scales
Compass No. 43 slide rule showing the A/B/CI/C/D scales
Compass No. 43 slide rule showing the A/S/L/T/D scales
Compass No. 43 slide rule showing the A/S/L/T/D scales
Back of the Compass No. 43 slide rule
Back of the Compass No. 43 slide rule
Compass No. 403 slide rule

Discover more from Imablog

Subscribe to get the latest posts sent to your email.