English scientist and astronomer (1836–1920) credited with Pierre Janssen as the co-discoverer of helium. Uncommon ALS, one page, 4.5 x 5.75, Solar Physics Observatory letterhead, November 21, no year. Response to an invitation, in full: “It will give me great pleasure to dine with you on Dec. 4.” In fine condition, with a few small stains affecting nothing. Pre-certified PSA/DNA.
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