ARNOLD, John (ca 1735-1799). An Account kept during thirteen Months in the Royal Observatory at Greenwich, of the going of a Pocket Chronometer, made on a New Construction. London: John Arnold, 1780. 4o. Modern boards. FIRST EDITION. Arnold, one of the most important English makers of chronometers (a term he had coined with Alexander Dalrymple), set up his own shop, after an apprenticeship with his father, and studies in the Netherlands. He supplied James Cook with three marine timekeepers for his second voyage, and simplified and improved Harrison's timekeeper. -- On the Longitude: in a Letter to the Honourable the Commissioners of that Board, containing Remarks on the Account given of a Clock in Manheim, and that of a Pocket Chronometer at Greenwich. London: G. Robinson, 1781. -- [Bound with:] An Answer from John Arnold to an Anonymous Letter on the Longitude. London: T. Becket, 1782. 2 works in one, 4o. Modern quarter morocco. (2)

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ARNOLD, John (ca 1735-1799). An Account kept during thirteen Months in the Royal Observatory at Greenwich, of the going of a Pocket Chronometer, made on a New Construction. London: John Arnold, 1780. 4o. Modern boards. FIRST EDITION. Arnold, one of the most important English makers of chronometers (a term he had coined with Alexander Dalrymple), set up his own shop, after an apprenticeship with his father, and studies in the Netherlands. He supplied James Cook with three marine timekeepers for his second voyage, and simplified and improved Harrison's timekeeper. -- On the Longitude: in a Letter to the Honourable the Commissioners of that Board, containing Remarks on the Account given of a Clock in Manheim, and that of a Pocket Chronometer at Greenwich. London: G. Robinson, 1781. -- [Bound with:] An Answer from John Arnold to an Anonymous Letter on the Longitude. London: T. Becket, 1782. 2 works in one, 4o. Modern quarter morocco. (2)

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