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PIERRE JULES CESAR JANSSEN (1824-1907)
Annales de l'observatoire d'astronomie physique de Paris sis Parc de Meudon. Tome Premier. Paris: Gauthier-Villars et Fils, 1896. 4° (283 x 225mm). 9 heliogravures and 12 photographs, these mounted on card with printed captions. (Scattered spotting, mostly in margins.) Original printed wrappers (spine evenly sunned, light scattered spotting, front blank loosening). Provenance: Paul Aubert (J. Janssen's inscription on half-title).
FIRST EDITION, PRESENTATION COPY, INSCRIBED: 'à Monsieur Paul Aubert souvenir affectueux J. Janssen'. With 12 of the remarkable photographic studies of the solar surface taken at Meudon which he later collected into his monumental Atlas de photographies solaires (1904). 'Janssen, who thought that "the photographic plate is the retina of the scientist", was ONE OF THE FIRST TO UNDERSTAND THAT A PHOTOGRAPH CAN DO MORE THAN RECORD WHAT THE EYE PERCEIVES' (DSB, VII, p.77). Janssen, a prophet of aviation and one of the precursors of observation outside the earth's atmosphere, made important contributions to the knowledge of solar structure. His observation that the existence of telluric rays made possible the chemical analysis of planetary atmospheres meant that as early as 1867 he was able to announce the presence of water vapour in the atmosphere of Mars.
Annales de l'observatoire d'astronomie physique de Paris sis Parc de Meudon. Tome Premier. Paris: Gauthier-Villars et Fils, 1896. 4° (283 x 225mm). 9 heliogravures and 12 photographs, these mounted on card with printed captions. (Scattered spotting, mostly in margins.) Original printed wrappers (spine evenly sunned, light scattered spotting, front blank loosening). Provenance: Paul Aubert (J. Janssen's inscription on half-title).
FIRST EDITION, PRESENTATION COPY, INSCRIBED: 'à Monsieur Paul Aubert souvenir affectueux J. Janssen'. With 12 of the remarkable photographic studies of the solar surface taken at Meudon which he later collected into his monumental Atlas de photographies solaires (1904). 'Janssen, who thought that "the photographic plate is the retina of the scientist", was ONE OF THE FIRST TO UNDERSTAND THAT A PHOTOGRAPH CAN DO MORE THAN RECORD WHAT THE EYE PERCEIVES' (DSB, VII, p.77). Janssen, a prophet of aviation and one of the precursors of observation outside the earth's atmosphere, made important contributions to the knowledge of solar structure. His observation that the existence of telluric rays made possible the chemical analysis of planetary atmospheres meant that as early as 1867 he was able to announce the presence of water vapour in the atmosphere of Mars.
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