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Details and Image
Type
Model No.
Maker
Country
Construction
Material
Date
Scale Length
Area of Use
Long and Long Scale Slide Rules
Unknown / Cooper 100 inch
Unknown
possibly UK
Wood/celluloid veneers
c1920
254 cm
Basic Calculations
Notes:
A long-scale segmented grid-iron slide rule similar to a Thacher. This example dates from before Stanley starting making them in 1923. The 100 inch scale is divided into 20 5-inch long scales.
Image 1
Image 2
Image 3
Image 4
Image 5
Image 6
Image 7
