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A Mercer's survey chronometer, two-day duration with Arnold…
Lot No.
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Description:
A Mercer's survey chronometer, two-day duration with Arnold type spring detent escapement and fusee and chain movement, silvered and engraved dial marked 'Thomas Mercer Maker to the Admiralty, The Indian Colonial & USA Governments, London & St. Albans, 12781', blued steel hands. Hours are numbered 0-23 with Arabic numerals. Bayonet bezel with shuttered winding hole in the glass. Dial is cut away to show a 59 tooth contact lifting wheel mounted on the seconds arbor and a contact blade which is lifted each second except for the 59th in each minute to enable an audible signal in earphones each second with the silence being a warning of the approach of the full minute. Mounted in blackened brass cylindrical case with external battery and microphone contacts and stop/start lever and encased in later heavy leather carrying case with strap, and pouch for safety ratchet winding key. Originally purchased by New Zealand Government in 1925 (c.f. Mercer: Mercer Chronometers p.210.)
Estimate:
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Price:
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Category:
Horology (Clocks & watches): Marine Chronometers