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  2. Chelsea Clock Company - Wikipedia

    en.wikipedia.org/wiki/Chelsea_Clock_Company

    The Chelsea Clock Company is an American clock manufacturing company founded in 1897. Clocks produced by Chelsea Clock Company have been found in the White House, on US Naval Ships, and in homes and offices around the world. The company continues to build and repair clocks at their corporate headquarters in Chelsea, Massachusetts.

  3. Marine chronometer - Wikipedia

    en.wikipedia.org/wiki/Marine_chronometer

    A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.

  4. List of clock manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_clock_manufacturers

    Lenzkirch Clock Co (Aktiengessellschaft fur Ukrenfabrikation) (1851-1929) factory operated by Junghans 1929-1932; Mauthe Clock Company (c1870 - 1976) Jakob Schlenker Grusen, Schwenningen (JSGUS/ISGUS) (1888–present) Johannes Schlenker, Schwenningen (1822-1883) then Schlenker and Kienzle (1883-1897) then Kienzle

  5. Longitude by chronometer - Wikipedia

    en.wikipedia.org/wiki/Longitude_by_chronometer

    Mechanical boxed Marine Chronometer used on Queen Victoria's royal yacht, made about 1865 Omega 4.19 MHz (4 194 304 = 2 22 high frequency quartz resonator) Ships Marine Chronometer giving an autonomous accuracy of less than ± 5 seconds per year, French Navy issued,1980

  6. John Harrison - Wikipedia

    en.wikipedia.org/wiki/John_Harrison

    John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.

  7. Antiques Roadshow (series 28) - Wikipedia

    en.wikipedia.org/wiki/Antiques_Roadshow_(series_28)

    – 1830s marine chronometer made by 'Ellicott and Smith', value £2,000 – 1950s jewellery, lyrebird brooch in 'baguette cut' diamonds, £10,000; and Cartier SA diamond ring, value £6,000 – 1915 wax doll used as shop mannequin, value £1,000 – collection of 19th century Canton porcelain Chinese plates value £6,000 [3] 28/14 2005-12-04 ...