18,50 USD
The Arithma is a mechanical add/subtract calculator made by Addiator of Germany (stamped "Made in Germany" on the back). Made of steel, this set is complete with original plastic case, stylus and folded instructions.
Various models were made from 1920 to 1982. Based on the style of the instruction sheet, this model dates from sometime in the late 50s or 60s. The Addiator is comprised of three components, the body containing multiple slides used for calculation, a stylus, and a handle to reset the Addiator. The calculations are performed by inserting the tip of the stylus in notches in the metal plates in the Addiator. This narrow version features 6 slides and a 6 digit display and measures 6.25" x 1.5" (without stylus). The case measures 6.5" x 2.25". All pieces are in extremely good condition.
A perfect gift for your mathematical genius... show them how it was done, old school!