Archive of Collections

Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
John Davis & Son (D&P) / Mannheim
John Davis & Sons
Celluloid over wood
late 1800's
25 cm
General Calculations

Notes: "This Davis slide rule is a standard Mannheim model with A, B, C, and D scales on the front, and S, L, and T scales on the back of the slide. The only gauge marks on the scales are Pi on the left side of the A & B scales, and Pi/4 on the right side, for finding the area of a circle. There is a ruler divided in centimeters and millimeters on the upper, beveled edge, and an inch ruler on the lower, vertical edge. "

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