The Slide Rule Trading Co., Paul Ross

Hemmi Slide Rule Catalogue Raisonne

Scales on Hemmi Stadia Rules

We have modernized the scale names on stadia slide rules but the M1 and M2 scales remain mysterious to non-surveyors.  Here is a description of the front scales on Hemmi stadia rules, models 90 - 96.  Note that there are two calculating scales on the bottom edge of the rule.