Cambridge Digital Library

• Location: London

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1. ▾ Collection
   • Darwin-Hooker Letters (28)
   • Longitude Essays (5)
   • National Maritime Museum Manuscripts (4)
   • Papers of John Pond (150)
   • Papers of Nevil Maskelyne (2)
   • Papers of the Board of Longitude (1530)
   • Royal Greenwich Observatory Archives (1691)
   • Sassoon Journals (5)
   • Treasures of the Library (3)
2. ▾ Subject
   • Longitude (1189)
   • Astronomy (1092)
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   • Time Measuring Instruments (675)
   • Nautical instruments (541)
   • Magnetism (221)
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   • experiment, scientific observation (7)
   • Geographical distribution (6)
   • Instrument manufacture (4)
   • queries / requests (4)
   • Adaptation (3)
   • Anthropology (3)
3. ▾ Date
   • 1700s C.E. (369)
   • 1800s C.E. (1374)
   • 1900s C.E. (5)