Cambridge Digital Library

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1. ▸  Collection
   • Royal Greenwich Observatory Archives (8)
2. ▸  Subject
   • Longitude (7)
   • ASTRONOMY (6)
   • Astronomy (6)
   • Marine navigation (6)
   • Nautical instruments (5)
   • Magnetism (2)
   • Time Measuring Instruments (2)
   • Geographical exploration (1)
3. ▸  Page has transcription
   • No (8)
4. ▸  Page has translation
   • No (8)
5. ▸  Languages