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The beauty and utility of maths
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Plaster model of a surface generated by a semi-circle, 1876.
'Little Professor' electronic calculator, 1980.
'Parker's Prestometer Tablet', c 1860.
Thomas de Colmar's Arithmometer, 1867.
Napier's Bones, 1671-1700.
'Numeric Demonstrator', c 1900.
Cardboard models of Second Order Surfaces, 1901.
The 'Tachypoly Plasiasme' ready reckoner, 1880-1884.
Mechanical cash register, c 1910.
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