Jaap Scherphuis | Seidel & Naumann Adding Machine @jaapsch2 | Uploaded June 2018 | Updated October 2024, 7 minutes ago.
The Seidel & Naumann Adding Machine, or SuN Adder is a chain adder. It was made in Dresden, Germany, between 1910 and about 1922.

For more information on this machine and other calculators in my collection, go to my site at:
jaapsch.net/mechcalc

0:00 Introduction
0:25 History
1:34 Stylus
2:20 Entering a number
4:00 Clearing
4:12 Multiplication
5:02 Outro