This page is part of the manufacturer's instruction
book for the Brunsviga 13RK mechanical calculating machine. The subtraction instructions continue from a
Page from the manufacturer's instruction booklet on how to subtract with the Brunsviga
13RK mechanical calculating machine. The instructions for subtraction
continue from the earlier page on addition.
There is more on addition and subtraction on the
This website Join me in the 1900s is
a contribution to the social history of everyday life in 20th century Britain
from the early 1900s to about 1960, seen through personal recollections and
illustrations, with the emphasis on what it was like to live in those times.