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Papers regarding the determination of the 129th Meridian, 1918-1928, comprised mostly of correspondence from Australia.
Papers regarding the latitude variation of Dehra Dun, India, 1929-1931.
Papers regarding the debate on the unification of astronomical, nautical and civil days into a universal 24-hour day, 1885-1897. There is a newspaper cutting from the 'Shipping Gazette and Ll...' [Lloyds List] of 11 February 1897 and several other printed papers and booklets.
Correspondence concerning longitudes and latitudes, 1903-1915.
Papers on the re-determination of the Paris longitude, 1898-1905.
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