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Marine Chronometers at GreenwichA Catalogue of Marine Chronometers at the National Maritime Museum, Greenwich$
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Jonathan Betts

Print publication date: 2018

Print ISBN-13: 9780199641383

Published to Oxford Scholarship Online: December 2017

DOI: 10.1093/oso/9780199641383.001.0001

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How the marine chronometer was made

How the marine chronometer was made

Chapter:
(p.73) Chapter Two How the marine chronometer was made
Source:
Marine Chronometers at Greenwich
Author(s):

Jonathan Betts

Publisher:
Oxford University Press
DOI:10.1093/oso/9780199641383.003.0002

This chapter describes the fascinating and highly skilled process of manufacture of a 19th century English marine chronometer. It covers the complete practice, from the sourcing of the raw materials right through to the completion of the precision instrument in its box and suspension and its testing and delivery to the final customer. The unusual, two-stage process, where a ‘rough movement’ is bought from a supplier in Lancashire and completed by the ‘finisher’, is explained, and the extraordinary journey taken by the ‘embryo’ chronometer, around the many specialist craftsmen living in the back streets of Clerkenwell, is described. The journey is also illustrated with a map of Clerkenwell with the route marked out, and a specific chronometer by Victor Kullberg in the museum’s collection has its journey to completion described and illustrated.

Keywords:   Rough Movement, Movement Maker, Finisher, Mainspring, Fusee, Adjuster, Gimbals, Dial, Engraver, Detent

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