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desk slide rule

desk slide rule

Keuffel & Esser Company
patented 1933
early model Log Log Duplex slide rule

early model Log Log Duplex slide rule

Keuffel & Esser Company
1908-1921
Keuffel & Esser Beginners' slide rule

Keuffel & Esser Beginners' slide rule

Keuffel & Esser Company
circa 1936
Keuffel & Esser Decilon slide rule

Keuffel & Esser Decilon slide rule

Keuffel & Esser Company
copyright 1961
Keuffel & Esser Decilon slide rule

Keuffel & Esser Decilon slide rule

Keuffel & Esser Company
copyright 1961
Keuffel & Esser log log duplex decitrig slide rule

Keuffel & Esser log log duplex decitrig slide rule

Keuffel & Esser Company
dated 1943
Keuffel & Esser Log Log Duplex Decitrig slide rule, modified scales

Keuffel & Esser Log Log Duplex Decitrig slide rule, modified scales

Keuffel & Esser Company
copyright 1947
Keuffel & Esser Log Log Duplex slide rule

Keuffel & Esser Log Log Duplex slide rule

Keuffel & Esser Company
ca. 1915-1923
Keuffel & Esser Polyphase Duplex slide rule

Keuffel & Esser Polyphase Duplex slide rule

Keuffel & Esser Company
circa 1935
Keuffel & Esser Polyphase slide rule

Keuffel & Esser Polyphase slide rule

Keuffel & Esser Company
circa 1917
Log Log Duplex Decitrig slide rule

Log Log Duplex Decitrig slide rule

Keuffel & Esser Company
circa 1943
Mannheim slide rule

Mannheim slide rule

Keuffel & Esser Company
1915-1930
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The Collection of Historical Scientific Instruments
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