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The New System of Time-Keeping at Sea



AN article in NATURE for April 25 described the new system of time-keeping at sea which was adopted last year by the British, French, and Italian Admiralties. The Board of Trade has now published a memorandum on the subject, with a coloured chart, adapted from a similar one prepared by the “Service hydrographique de la marine française.” Reference may also be made to useful explanatory articles by M. J. Renaud in “Annuaire du Bureau des Longitudes, 1918,” and in L'Astronomie for April, 1918.

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