Duplex slide rule

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  • Details
  • Description
Date Introduced
1902
Photographer
Richards, Mark
Dimensions
3/8 x 11 x 1 1/4 in.
Manufacturer
Keuffel & Esser Company
Credit Line
Gift of Tom McIntyre
Copyright Owner
© Mark Richards
Location
United States
Keywords
Oughtred, William; Analog; Hand calculation
Object ID
X170.83B

An early example of slide rules used by generations of engineers, with a sliding metal "indicator." Glass indicators were more popular after about 1910.