Log-Log Duplex Trig slide rule

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  • Description
Date Introduced
1939
Photographer
Richards, Mark
Dimensions
1/2 x 23 3/4 x 2 1/8 in.
Manufacturer
Keuffel & Esser
Credit Line
Gift of Richard Clayton
Copyright Owner
© Mark Richards
Location
United States
Keywords
Oughtred, William; Hand calculation; Analog
Object ID
XD50.76

Structural engineers often used extra-long rules for greater accuracy.