Mr Owensby inadvertantly directed me down a route of investigation that lead me to arithmometers! Created by Charles Xavier Thomas de Colmar of France in 1820, it was one of the first commercially successful arithmatic machines (not including the abacus etc – you know what I mean, with cogs and such). Apparently big enough to cover a desk, it would do addition, subtraction, multiplication, and if you didn’t mind getting involved in the process, division too. You can even find the patent online (with pictures of gearing, joy!). Sold for a good 30 years before being replaced.
Thanks Mr Owensby! I know it’s not what you sent (and I’ll no doubt get to that soon) but it’s related. *smiles*

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