Tinner's Steel Circumference Rules
Standard rule with tinners and other steel metalworkersTempered medium-weight steelHole in one end for hangingMarkings are black for easy reading954 model, one side upper edge marked inches to 1/16thsLower edge marked up to 150 circumference inches to 1/8thsReverse side of model has formulas for calculating circumference, diameter, area, etc. and size table for laying out measures and cans