TitleFraction of an inch adding machine (circular stylus adder or slide rule)
Dimensionsoverall: 1/8 in x 4 1/4 in x 4 1/4 in
DescriptionObject is a circular stylus adder designed to add fractions together. It bears the following notations: "Fraction of an inch adding machine;"
"Waldes Truarc retaining rings" written on top surface;" "K. Jaeger."