Henri BECQUEREL. Autograph letter (highly corrected draft in - Lot 120

Lot 120
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Estimation :
600 - 800 EUR
Henri BECQUEREL. Autograph letter (highly corrected draft in - Lot 120
Henri BECQUEREL. Autograph letter (highly corrected draft in very difficult-to-read tight handwriting) to a physicist (name noted in pencil, not deciphered). 2 pp. in-8, on mourning paper. [July 1892]. Beautiful scientific letter on wavelengths in the infrared spectrum. "You must have received a letter from me explaining why I was unable to reply earlier to the letter you did me the honor of writing to me. Since 1884, I have not published any new measurements on infra-red spectra. I had published in 1883 in the Annales de Chimie et de Physique [...]. The drawings of the prismatic spectra are accurate, but the wavelength numbers beyond 0.001000 are too low. I had obtained them by another solution using a number obtained by my father in the past, which was too low. I used a network to measure the main lambda values of the spectrum [...]". Since then, he has carried out other, as yet unpublished, verifications, evoking the work of Herschel, Fizeau and Foucault...
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