|Letter from Isambard Kingdom Brunel to Mr George Biddle Airy
|Written from 18 Duke Street, London. The letter sends Airy some naval instruments (especially Captain Beecher's horizon instrument) for his inspection and approval, asks several questions about the exact operation of the device and its accuracy and points out certain parts of the device and its construction that Brunel considers to be flawed or in need of improvement. The letter also questions the principles on which the instrument is designed and explains how the instruments being designed by Brunel and Professor Piazzi Smyth will improve on this instrument.
|31 January 1855
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