Harrison, John THE PRINCIPLES OF MR. HARRISON'S TIME-KEEPER, WITH PLATES OF THE SAME. PUBLISHED BY ORDER OF THE COMMISSIONERS OF LONGITUDE. LONDON: W. RICHARDSON AND S. CLARK, 1767, FIRST EDITION, 31PP., HALF-TITLE, 10 FOLDING ENGRAVED PLATES, [ADAMS AND WATERS 2018; HORBLIT 42B; NORMAN 995; TAYLOR II 60] Maskelyne, Nevil. An Account of the Going of Mr. John Harrison's Watch, at the Royal Observatory, from May 6th, 1766 to March 4th, 1767. Together with the original observations and calculations of the same... Published by Order of the Commissioners of Longitude. London: W. Richardson and S. Clark, 1767,FIRST EDITION, 28, lvi pp., [Adams and Waters 2425; Norman 997] Le Roy, J.D. A succinct account of the attempts of Mess. Harrison and Le Roy, for finding the Longitude at Sea, and of the proofs made of their works... To which is prefixed, a summary of the Marquis de Courtanvaut's Voyage, for the Trial of certain Instruments for finding the Longitude at Sea. Done from the French, by a Fellow of the Royal Society. London: for F. Newbery, 1768, 14, i-xii, 1-54pp., [Adams and Waters 2262; Taylor II 622] together 3 works in one volume, 4to (264 x 198mm.), loosely inserted page of manuscript notes in ink by a contemporary reader about Harrison's time-keeper, contemporary half calf over marbled boards, red morocco label, minor worming to foot of lower joint From the library of Matthew Boulton The second work in this volume is Maskelyne's report on the accuracy of Harrison's marine chronometer. "Maskelyne was known to favor the rival method of finding longitude by means of lunar tables, and he accordingly subjected Harrison's chronometer, which had already performed well on two West Indian voyages, to a series of extreme and unrealistic tests. The predictably disappointing results were published in the present pamphlet, along with Maskelyne's conclusion that 'Mr Harrison's watch cannot be depended upon to keep the longitude within a degree in a West India voyage of six weeks... nevertheless... it is a useful and valuable invention' " (Norman). The third work in this volume is "an account by Julian David Le Roy of the watch made by his son Pierre Le Roy" (Adams and Waters).
Harrison, John THE PRINCIPLES OF MR. HARRISON'S TIME-KEEPER, WITH PLATES OF THE SAME. PUBLISHED BY ORDER OF THE COMMISSIONERS OF LONGITUDE. LONDON: W. RICHARDSON AND S. CLARK, 1767, FIRST EDITION, 31PP., HALF-TITLE, 10 FOLDING ENGRAVED PLATES, [ADAMS AND WATERS 2018; HORBLIT 42B; NORMAN 995; TAYLOR II 60] Maskelyne, Nevil. An Account of the Going of Mr. John Harrison's Watch, at the Royal Observatory, from May 6th, 1766 to March 4th, 1767. Together with the original observations and calculations of the same... Published by Order of the Commissioners of Longitude. London: W. Richardson and S. Clark, 1767,FIRST EDITION, 28, lvi pp., [Adams and Waters 2425; Norman 997] Le Roy, J.D. A succinct account of the attempts of Mess. Harrison and Le Roy, for finding the Longitude at Sea, and of the proofs made of their works... To which is prefixed, a summary of the Marquis de Courtanvaut's Voyage, for the Trial of certain Instruments for finding the Longitude at Sea. Done from the French, by a Fellow of the Royal Society. London: for F. Newbery, 1768, 14, i-xii, 1-54pp., [Adams and Waters 2262; Taylor II 622] together 3 works in one volume, 4to (264 x 198mm.), loosely inserted page of manuscript notes in ink by a contemporary reader about Harrison's time-keeper, contemporary half calf over marbled boards, red morocco label, minor worming to foot of lower joint From the library of Matthew Boulton The second work in this volume is Maskelyne's report on the accuracy of Harrison's marine chronometer. "Maskelyne was known to favor the rival method of finding longitude by means of lunar tables, and he accordingly subjected Harrison's chronometer, which had already performed well on two West Indian voyages, to a series of extreme and unrealistic tests. The predictably disappointing results were published in the present pamphlet, along with Maskelyne's conclusion that 'Mr Harrison's watch cannot be depended upon to keep the longitude within a degree in a West India voyage of six weeks... nevertheless... it is a useful and valuable invention' " (Norman). The third work in this volume is "an account by Julian David Le Roy of the watch made by his son Pierre Le Roy" (Adams and Waters).
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