Cambridge Digital Library

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1. ▸  Collection
   • Royal Greenwich Observatory Archives (5)
2. ▸  Subject
   • Longitude (5)
   • Time Measuring Instruments (4)
   • Horology (3)
   • ASTRONOMY (1)
   • Astronomy (1)
   • Nautical instruments (1)
   • Navigational aids (1)
   • Ocean currents (1)
3. ▸  Page has transcription
   • No (5)
4. ▸  Languages
5. ▸  Date
   • 1700s C.E. (1)
   • 1800s C.E. (4)