The Adall #Calculator from 1910 is a single-column #addingmachine based on a hundred-tooth disc. The Adall is presented in a fitted and lined wooden case, with a pocket for a small bone operating stylus. Some versions have the name spelt "Adal" rather than "Adall".

Manufactured: Adall Company, #Birmingham , #England , 1910-1920s

#calcul #machine #belobjet #madeinengland #unionjack

http://www.johnwolff.id.au/calculators/adders/adders.htm

Other recent acquisitions are a couple wee adding machines. The smaller one is plastic and both adds and subtracts. The larger is metal and older. It only adds.

Well, you _can_ subtract within a digit, but carries won't propagate back.

#addingmachine #addingmachines