Comptator Chain Slide Adder
comptator.jpg (17765 bytes)

"This item was produced in 1920 by "Comptator" Germany.

The stylus was inserted in the groves and moved downwards for addition. Subtraction was implemented by using the complementary method. The right hand lever is used for zeroing the display"

Erez Kaplan

Source: Calculating Machines - Erez Kaplan

X-Number World of Calculators