Joseph Vallot (1854-1925), astronomer, naturalist and mountaineer, founder of the Mont-Blanc meteorological observatory. L.A.S. to his "dear André". 6 pp. in-8. Heading of the observatory.
Nice letter on the development of his slope indicator, which causes him concern and disappointment. "The shaking makes the needle go constantly to the large slope indicator []". It evokes his races, his character and the father of his correspondent, whose silence and company he appreciates. "The calm I enjoy here pleases me beyond all expression. I have tried to go to the theatre, but I like my bed even better....
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