Cambridge Digital Library

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1. ▾ Collection
   • Darwin Manuscripts (1)
   • Papers of Nevil Maskelyne (2)
   • Papers of the Board of Longitude (54)
   • Royal Greenwich Observatory Archives (56)
2. ▾ Subject
   • Astronomy (55)
   • Longitude (36)
   • Discoveries in geography (34)
   • Navigation (34)
   • Geographical exploration (20)
   • Marine navigation (20)
   • Navigational aids (9)
   • Horology (8)
   • Time Measuring Instruments (3)
   • Magnetism (1)
   • Nautical instruments (1)
3. ▾ Date
   • 1700s C.E. (8)
   • 1800s C.E. (56)