Circular slide rule

SMG00031930

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SMG00031930
Science Museum Group
© The Board of Trustees of the Science Museum

Circular slide rule, watch form, in metal case, known as "Halden Calculex", with printed pamphlet of instruction

Details

Category:
Mathematics
Object Number:
1921-666
Materials:
metal (unknown), glass, velvet, leather and paper (fibre product)
Measurements:
overall (closed): 22 mm x 64 mm x 85 mm, 0.098 kg
type:
circular slide rule
credit:
Shackleton, M.H.