Stephenson Adding Machine
"This example of the Stephenson is nickel plated, in good condition, and operating perfectly with an easy, smoothe action. This item was intended for use asn aid for paper adding. Single digits are entered in the right wheel, and carries are automatically executed on the left wheel, which goes up to 19, making the total capacity 199. I do not believe any example of this machine reach a 209 capacity. Obverse is shown with ruler for size reference. Section of reverse at 2x magnification is shown below. The lettering is hard to read, so transcription is provided. Note: this does not appear to be one of the many later copies of this device made into the 1920's. It appear date from the original introduction." Darryl Rehr, 05/01/98.

Courtesy of: Darryl Rehr

X-Number World of Calculators