"Calculex" Circular Slide Rule

Made:
1908 in United Kingdom
maker:
J Halden and Company Limited

Halden's 'Calculex' patent circular slide rule in silver case.

Details

Category:
Mathematics
Object Number:
Y1981.20.1
Materials:
glass and silver (metal)
type:
slide rule
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • calculator
credit:
Gift of Mr. P.F. Lee