"Calculex" Circular Calculator

Made:
1910-1920 in England
maker:
J Halden and Company Limited

J Halden & Co Ltd 'Calculex' circular calculator, c. 1915, with case and instruction booklet.

Details

Category:
Mathematics
Object Number:
YL1973.1
Materials:
brass (copper, zinc alloy), glass, leather, metal (unknown), paper (fibre product) and wood (unidentified)
Measurements:
case: 42 mm x 200 mm x 168 mm,
type:
slide rule
taxonomy:
  • furnishing and equipment
  • tools & equipment
  • calculator
credit:
Courtesy of Mrs. B.H. Shaw