Pocket watch slide rule Calculigraphe. HC París. Silver plated metal. 1900's
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Description
Pocket watch mechanical slide rule.
France. Circa: 1900's.
Maker: HC Paris. Brand: Calculigraphe.
Silver plated metal. White metallic dials.
More information
Black arabic numerals and blued steel hands.
Cube root and square root scales.
Fine condition. Work well. Normal wear use for its age.
Measures: 5,6 cm diameter, without crown, and 0,8 cm thickness.
Weight: 76 grams.
Antique mechanical slide rules.
Ancient calculators and adding machines.
Calculigraphe mechanical slide rules.
Technical antiques. Collectables.
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