Wellcome Collection
George Bidder, a mental calculator, aged thirteen. Line engraving by J.H. Robinson, 1819, after Miss Hayter.
A. Hayter · 1819
Lettering: George Bidder, of Devonshire, aet.13. Whose extraordinary power of calculation developed itself without instruction & reached an unprecedented height before he attained his seventh year. Painted by Miss Hayter. Engraved by J.H. Robinson.
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