Ham's proof rule

Made:
1855-1865 in England
Ham's proof rule, 4ft x 3, with three slides, c. 1860'

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Ham's proof rule, 4ft x 3, with three slides, c. 1860'
Science Museum Group
© The Board of Trustees of the Science Museum

Ham's proof rule, 4ft x 3", with three slides, c. 1860

Details

Category:
Mathematics
Object Number:
1954-322
type:
slide rule (excise) and slide rule (ham)
credit:
National Maritime Museum (Gabb Collection)