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  • George Bidder, a mental calculator, aged twelve. Line engraving by S. Springsguth, 1818.
  • George Bidder, a mental calculator, as a boy. Aquatint by H. Meyer, 1817, after W. Waite.
  • George Bidder, a mental calculator, aged thirteen. Line engraving by J.H. Robinson, 1819, after Miss Hayter.
  • A futuristic vision: the advance of technology leads to rapid transport, sophisticated tastes among the masses, mechanization, and extravagant building projects. Coloured etching by W. Heath, 1829.
  • A futuristic vision: the advance of technology leads to rapid transport, sophisticated tastes among the masses, mechanization, and extravagant building projects. Coloured etching by W. Heath, 1829.