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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Circular and Spiral Slide Rules
Barron / Chandler?s Adding and Subtracting Scale
J.S. Barron
USA
Celluloid
1909
Ø 8.2 cm
Adding and Subtracting
Notes:
"Slide chart with copyrighted design by E. F. Chandler for doing addition and subtraction with either: (i) fractions, (ii) in 1/64th increments, (iii) their decimal equivalents or (iv) mixed calculations."
Image 1
Image 2
