Refine by:
-
▾ Collection
- National Maritime Museum Manuscripts (2)
- National Maritime Museum Print Works (2)
- Papers of John Pond (132)
- Papers of Nevil Maskelyne (1)
- Papers of the Board of Longitude (51)
- Royal Greenwich Observatory Archives (188)
-
▾ Subject
- Time Measuring Instruments (172)
- Marine navigation (118)
- Longitude (90)
- Horology (45)
- ASTRONOMY (7)
- Geographical exploration (7)
- Legislation (5)
- Navigational aids (5)
- Navigation (2)
- Magnetism (1)