Horology and Science Books | 11 April 2013
Horology.- Harrison (John) - The Principles of Mr. Harrison's Time-keeper,
Horology.- Harrison (John)
The Principles of Mr. Harrison's Time-keeper,
with plates of the same, first edition , half-title, 10 folding engraved plates, signature A (half-title, title & preface) all torn and skillfully repaired (affecting a few letters but without significant loss), washed and trimmed but with a few light traces of damp-staining, modern half calf, spine ruled in gilt with red morocco label, [Baillie p.272; Clockmakers' 205; Tardy p.125], 4to, W.Richardson and S.Clark…[for] John Nourse, and Mess.Mount and Page, 1767.
⁂ Harrison completed his great sea clock No. 4 (H4) in 1759, striving for the accurate time-keeping essential for a determination of longitude. A prize of 'a320,000 had been offered under the Longitude Act of 1714 for an accurate time keeper. H4 was sent off on a trial trip to the East Indies in 1761-62 and lost a mere 2 minutes over some 5 months. The Longitude Board insisted on a second trip in 1764, and again H4 satisfied the conditions, but again Harrison was awarded nothing. This is the first description of H4, published by the Commissioners of Longitude and with Nevil Maskelyne's preface and notes taken by him during Harrison's dismantling of the watch to demonstrate the construction. Eventually, and partly as a result of this "discovery", the injustice was righted in 1773.
Thursday 11 April 2013, 1.00pm
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11th April from 9.30am