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Jedediah Buxton, a mental calculator. Etching after Mary Hartley.

Zerah Colburn, a mental calculator, as a child. Stipple engraving by H. Meyer, 1813, after T.H. Hull.

Jedediah Buxton, a mental calculator. Etching by Mary Hartley, 1764.

Jane Shore (mistress of King Edward IV), Henry Hastings (Dorset landowner and sportsman), Jedediah Buxton (mental calculator), and Mary Davis (with horns). Etching, 1808.

George Bidder, a mental calculator, aged twelve. Line engraving by S. Springsguth, 1818.

Master Noakes, a mental calculator. Lithograph by A. Mosses, 1827.

Jedediah Buxton, a mental calculator. Line engraving.

Jedediah Buxton, a mental calculator. Mezzotint by J. Spilsbury, 1781, after B. Killingbeck.

Zerah Colburn, a mental calculator, as a child. Engraving, 1813.

George Bidder, a mental calculator, as a boy. Aquatint by H. Meyer, 1817, after W. Waite.

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Mental calculators

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Jedediah Buxton, a mental calculator. Line engraving.

Master Noakes, a mental calculator. Lithograph by A. Mosses, 1827.

Jedediah Buxton, a mental calculator. Etching by Mary Hartley, 1764.

Jane Shore (mistress of King Edward IV), Henry Hastings (Dorset landowner and sportsman), Jedediah Buxton (mental calculator), and Mary Davis (with horns). Etching, 1808.

Jedediah Buxton, a mental calculator. Etching after Mary Hartley.