Scientific Instruments > Calculating

Seidel & Naumann Adding and calculating machine.

Item#: SCI1159

SOLD

 

This S&N calculating machine was made by Seidel in 1910 for small business in Germany. With fixed point attitude and the change-over between individual invoice and multiple addition. 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.