English astronomer Norman Lockyer independently devised a method to observe the sun without an eclipse and made a similar spectral observation around the same time as Janssen.
Sources
- How Scientists Discovered Helium, the First Alien Element, 150 Years Ago (smithsonianmag.com)
- https://www.lindahall.org/about/news/scientist-of-the-day/norman-lockyer/ (lindahall.org)
- https://aas.aanda.org/articles/aas/full/2000/18/ds9707/node7.html (aas.aanda.org)
- https://www.nature.com/articles/137809b0 (nature.com)
- https://blog.sciencemuseum.org.uk/150-years-since-the-discovery-of-helium/ (blog.sciencemuseum.org.uk)
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