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Thompson's slide rule

Thompson's slide rule

1833

Roget's log-log slide rule, brass, with case. Displayed at the Great Exhibition, 1851 at Hyde Park, London.

Roget's log-log slide rule with case

1814-1851

Ten inch slide rule, faced with celluloid, with spare log-log slide as arranged by Lt Col H.G. Dunlop R.F.A. and C.S. Jackson M.A. in case.

Ten inch slide rule with case

Log-log Duplex slide-rule, plastic, 12 7/8" x 1 3/4", Janus series No. T.50, with cursor with box.

Log-log Duplex slide-rule

1958-1959

Decitrig model Log-Log Duplex slide rule with leather case by Keuffel & Esser Company, New York, USA.

Decitrig model Log-Log Duplex slide rule with leather case by Keuffel & Esser Company

1940-1950