Otis King pocket calculator (a spiral logarithmic slide rule)

Made:
1920-1925 in London
Otis King  pocket calculator (a spiral logarithmic slide rule)

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Otis King pocket calculator (a spiral logarithmic slide rule)
Science Museum Group
© The Board of Trustees of the Science Museum

Otis King pocket calculator (a spiral logarithmic slide rule), Model K, c1925.

Details

Category:
Mathematics
Object Number:
1997-135
Materials:
steel, paper and card
Measurements:
overall: 150 x 35 mm
type:
spiral slide rule
credit:
Mr D.H. Dean