Description

The present calculating device, invented and patented by the Parisian Casimir Louis Chambon in 1876, is a four printed cylinder of 1 to 9, 10 to 90, 100 to 900 and 1000 to 9000 so arranged that percentages for every half percent from one to six percent can be read through slits. 

It includes 396 cells. The total of say 6,216 at 4 percent could be figured by adding the sums shown in the four rows. The “Tachylemme portatif” of Chambon is adopted to calulate interest on all sums from one franc to one million of franes and at any desired rate.

The present example is one the earliest examples printed by “Baster & Vieillemard”. The late examples, offered for sale by Chambon & Bayle compagny, are engraved “Chambon & Baye” and printed by “Girard & fils.”

The four cylinders turn perfectly and the condition is excellent and genuine.

Made in wood, paper, silvered metal and glass. 

It measures : 175 x 100 x 35 mm.