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Japanese Astronomical computer

Japanese Astronomical computer

"Rouleau" calculator

"Rouleau" calculator

1920
Thacher's cylindrical slide-rule in fitted mahogany box; base marked "Keuffel & Esser Co. N.Y. 4012 3328"

Thacher's cylindrical slide-rule in fitted mahogany box; base marked "Keuffel & Esser Co. N.Y. 4012 3328"

Loga calculator (cylindrical slide rule) patented by Daemen-Schmid, Zurich

Loga calculator (cylindrical slide rule) patented by Daemen-Schmid

"Rouleau" calculator, no.16, with waterproof cover (a cylindrical slide rule)

"Rouleau" calculator

1920
Thacher's cylindrical slide rule, made by Keuffel and Esser, model no. 4012, serial no. 3412, plates engraved by W.F. Stanley.

Thacher's cylindrical slide rule

1884