954 FTN Lufkin Tinner’s Steel Circumference Rule

954ftn Lufkin standard rule with tinners and other steel metalworkers. Tempered medium-weight steel with a hole in one end for hanging. Markings are black for easy reading.
954 model, one side upper edge marked inches to 1/16ths.
Lower edge marked up to 150 circumference inches to 1/8ths.
Reverse side of model has formulas for calculating circumference, diameter, area, etc. and size table for laying out measures and cans.
Length: 4 ft
Width: 1 1/4 in
Thickness: 1/16 in
Increments: @ Scale 1/16 in @ 1 in, 1/8 Dia. in @ 1 Circumf. in
No. of Scales: 2
Material: Steel
Measuring System: Inch
Type: Measurement Rule
Wt. 1.04 lb