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TYNDALL, John (1820-1893). Natural philosopher. Autograph Letter Signed to an unnamed correspondent, 1 page 8vo (traces of former mounting on the reverse), blind stamp of the Royal Institution, 30 March no year. Describing the equipment used in the the public demonstration of a scientific experiment, explaining how the effect may be obtained, and suggesting that Mr Ladd of Beak Street could supply the apparatus. [No: 21921]
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