Cambridge Digital Library

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1. ▾ Collection
   • Longitude Essays (1)
   • Papers of the Board of Longitude (4)
   • Royal Greenwich Observatory Archives (5)
2. ▾ Subject
   • Nautical instruments (5)
   • Longitude (4)
   • Ocean currents (4)
   • Time Measuring Instruments (4)
   • Dead reckoning (Navigation) (1)
3. ▾ Date
   • 1700s C.E. (2)
   • 1800s C.E. (5)