An illustration of a man using Lockyer's telespectroscope. Sir Joseph Norman Lockyer (1836-1920), designed this instrument in order to observe the spectra of the prominences in full sunlight. Lockyer is best known for discovering helium after observing it as a yellow line in the spectrum taken from the sun.
Schellen, Heinrich. “Lockyer's Telespectroscope.” Spectrum Analysis in Its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies. London, England, 1872. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2j62s602t.
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