3 0 c m
40cm
actual image size: 32cm x 22cm
Description
Barrel calculating machines were smaller, lighter and easier to operate than their predecesors, Arithmometers. The machine performs multiplication by repeated addition and included the wheel with a variable number of teeth as patented by Willgodt T Odhner (1845-1905) in 1891. Odhner sold the German patent to Mesrs Grimme, Natalis & Co.
Image Details
Image Ref.
10302733
© Science Museum / Science & Society Picture Library