Important and rare slide rule engineer's calculigraph around - Lot 60

Lot 60
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Estimation :
700 - 900 EUR
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Result : 830EUR
Important and rare slide rule engineer's calculigraph around - Lot 60
Important and rare slide rule engineer's calculigraph around 1900. Silver plated metal case, two setting pushers, fluted crown and oval belliere.Large concentric circles with various scales engraved on two brass discs and adjustments by two external pushers. Enamelled dial with black painted Arabic, Roman and railway numerals in the centre, central second hand, superb condition and movement. Case n° 511 This watch combined with a calculating circle was invented and patented in 1880 by Charles Meyrat and Rodolphe Perdrizet and then produced by Alphonse Beaudroit in Seloncourt. Diameter: 64 mm A similar model is preserved and presented in the Uheren Museum " Furtwangen Clock Museum.
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