Halden "Calculex" patent circular slide rule
Halden "Calculex" patent circular slide rule (5 inches diameter), c. 1906.
- Object Number:
- 1970-639/1
- type:
- circular slide rule
- Image ©
- The Board of Trustees of the Science Museum
Halden "Calculex" patent circular slide rule (5 inches diameter) in case
- Made:
- 1904-1907 in Manchester
- maker:
- J Halden and Company Limited
Halden "Calculex" patent circular slide rule (5 inches diameter) in case, c. 1906
Details
Parts
Case for Halden "Calculex" patent circular slide rule
Case for Halden "Calculex" patent circular slide rule.
