Adding machine, c 1910.
4 0 c m
actual image size: 26cm x 32cm

Adding machine, c 1910.

Hills, Jennie

© Science Museum / Science & Society Picture Library


S & N adding machine by Seidel & Naumann, Dresden. The Seidel and Naumann adding machines used chain drives and a stylus. The numbers to be added were pulled down to the base bar and then appeared in the result window. Presing the lever A allowed the inputted figures to be checked before the machine reset, while presing M allowed faster work as each figure reset when the stylus was removed. Subtraction was performed using the complementary columns at the sides.



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