A refracting telescope with a split objective lens, used for finding the angular distance between two stars.
- After the expedition the heliometer was donated to the Observatory who built a tower for it.
- He also determined the distances, using the heliometer, of twenty of the brighter and nearer Southern stars.
- And so, the phenomenon in 1882 was observed by cameras held by the French and the Americans, and timings were measured with the help of heliometers in most European organizations.
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