'Superdigit' mathematical calculator mb-code 1238411 View set within an ornamental

View set within an ornamental border

Golfer Charles Bob during the Piccadilly Championship

the Duke of Wellington (Tom) is standing behind him and on the extreme Lord Lyndhurst is holding an umbrella

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'Superdigit' mathematical calculator mb-code 1238411 View set within an ornamentalAbacus like mathematical instrument consisting of 384 moving squares intended for calculation. The author indicated that 'The Quickest Operation upon this Instrument, is by a New Method of Infinite Series, called the Decimal Series.' The first of six figures from the paper 'The arithmetic of the superdigit', by Robert Flower, signed and dated on 18 April 1742 [but endordsed 1741] and sent to the Royal Society. Not published in Philosophical