Circular D20 Tank Capacity (Imperial) ready reckoner calculator in plastic sleeve by Fearn Calculators limited

Made:: 1965-1975 in Gateshead

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Circular D20 Tank Capacity (Imperial) ready reckoner calculator
Science Museum Group
© The Board of Trustees of the Science Museum

Circular D20 Tank Capacity (Imperial) ready reckoner calculator in plastic sleeve by Fearn Calculators limited, Dunstan, Gateshead.

Details

Category:: Mathematics

Object Number:: 1998-465

Materials:: plastic and complete

Measurements:: overall: 5 x 190 x 190 mm

type:: ready reckoner (engineering)

credit:: Mr J.C. Michie

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Circular D20 Tank Capacity (Imperial) ready reckoner calculator in plastic sleeve by Fearn Calculators limited

Details

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