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The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.
Thomas Fuller (1710 – December 1790), also known as "Negro Demus" and the "Virginia Calculator", was an enslaved African renowned for his mathematical abilities. [1]
There are two main types of cylindrical slide rules: those with helical scales such as the Fuller calculator, the Otis King and the Bygrave slide rule, and those with bars, such as the Thacher and some Loga models. In either case, the advantage is a much longer scale, and hence potentially greater precision, than afforded by a straight or ...
Fuller calculator, an advanced cylindrical slide rule with a helical scale; Fuller's earth, clay used for filtering and purifying; Fuller (metalworking), a tool used to form metal when hot; Fuller (weapon), a groove in a knife or sword blade to lighten and stiffen the blade; USS Fuller, the name of two ships of the U.S. Navy
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A mental calculator or human calculator is a person with a prodigious ability in some area of mental calculation (such as adding, subtracting, multiplying or dividing large numbers). In 2005, a group of researchers led by Michael W. O'Boyle, an American psychologist previously working in Australia and now at Texas Tech University , has used MRI ...