Circular slide rule

Made:
Reddish
maker:
J Halden and Company Limited

Circular slide rule, Halden 'Calculex', in leather pouch with instruction booklet

Details

Category:
Mathematics
Object Number:
1984-1638
type:
circular slide rule
credit:
Mr E.B.Ball

Parts

Halden's 'Calculex'

Halden's 'Calculex'

Circular slide rule, Halden's 'Calculex'.

Materials:
metal (unknown)
Object Number:
1984-1638/1
type:
circular slide rule
Image ©
The Board of Trustees of the Science Museum
Leather pouch for Halden's 'Calculex'

Leather pouch for Halden's 'Calculex'

Leather pouch for Halden's 'Calculex'.

Materials:
leather
Object Number:
1984-1638/2
type:
pouch
Image ©
The Board of Trustees of the Science Museum

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