From:
Charles Pritchard
To:
Sir John Herschel
Date:
[10 June 1861]
Source of text:
RS:HS 14.82
Summary:
Observes and measures sunspots. Takes spectrum of solar photosphere; detects sodium and magnesium absorption lines. Pleased with Alexander Herschel's work on the solar spectrum; wishes he would begin work on stellar spectra.
Contributor:
John Herschel Project