Henri BECQUEREL and André BROCA (1863-1925), physicist and p - Lot 122

Lot 122
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Estimation :
3000 - 4000 EUR
Henri BECQUEREL and André BROCA (1863-1925), physicist and p - Lot 122
Henri BECQUEREL and André BROCA (1863-1925), physicist and physician; in 1904, he and his colleague Jean Becquerel were involved in the N-ray hoax. - Henri BECQUEREL. "Rapport sur les travaux de Mr André Broca par Mr Becquerel". Autograph manuscript, 5 pp. large folio, with numerous corrections. Very interesting text highlighting the physics research work of André Broca, who was running for the position of physics répétiteur at the École Polytechnique. "In 1897, Mr. Zeeman's discovery of the influence of a magnetic field on the period of vibrations emitted or absorbed by light sources, an influence predicted by Mr. Lorentz's theory of electrons, immediately prompted the investigations of a large number of experimentalists. Mr. Broca was one of those who made a contribution to the new order of ideas. First of all, by means of a judiciously conceived experiment, he showed that through a very thin layer of magnetized iron, the phenomenon of magnetic rotatory polarization does not correspond to a variation in the period [...] then he investigated whether the conditions of symmetry that characterize light emission in a magnetic field would not manifest themselves with cathode rays [...]. In the same order of phenomena, we should also mention new results concerning disruptive discharges in a vacuum, and the existence of anode rays magnetically deflected in the opposite direction to cathode rays, and carrying metal ions which deposit on tube walls [...]". - Print: "Titres et travaux scientifiques de André Broca, candidat à une place de répétiteur de physique à l'École polytechnique", 7 pp. in-8. List of 69 scientific publications up to 1902, supplemented by 3 sheets in André Broca's hand, and 32 other publications up to 1906. - André BROCA. Autograph manuscript, 20 pp. in-4 (+ 5 pp.), entitled: "Specific inductive power of conductors and specific inductive power of glass as a function of frequency".
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