Barnes Brothers' constantnometer and ampere rule.

Made:
1903 in St Louis

Barnes Brothers' constantnometer and ampere rule. Two calculating rules in double-faced watch cases.

Details

Category:
Mathematics
Object Number:
1997-1862
Materials:
calculators, steel, paper, glass, case, card, cloth
Measurements:
calculator [x2]: 15 x 55 x 80 mm
case: 25 x 165 x 105 mm
type:
calculating rule
credit:
Tesseract
status:
Permanent collection

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