Subject
- Astronomical instruments[remove]14
- Scientific Equipment14
- Astronomy8
- Science8
- Astronomical Observatories7
- Research Facilities7
- Events3
- Exhibitions3
- Solar Eclipse observations (6 April 1875), 18753
- Cameras2
- Geodesic Conference, Nice, 18872
- Heliostats2
- Optical Devices2
- Photographic Equipment and Supplies2
- Astrolabes1
- Astronomical Globes1
- Clocks & Watches1
- Cracow Archaeology and Art Exhibition, 1858-591
- Great Exhibition, London, 18511
- Gu Guanxiangtai (Observatory, Beijing)1