FIZEAU EXPERIMENT: "Sur les hypothèses relatives à l'éther lumineux, et sur une expérience qui paraît démontrer que le mouvement des corps change la vitesse à laquelle la lumière se propage dans leur intérieur." (Comptes Rendus Hebdomadaires des Séances de l'Académie des Sciences, Vol. 33; pp. 349-355) de Fizeau, Hippolyte - 1851

1849. Paris, Victor Masson, Imprimerie de Bachelier, 1849-50. No wrappers. In "Annales de Chimie et de Physique", 3me Series - Tome XXVI a. XXX., Juin 1849 a. Octobre 1850. (The entire issues offered). Titlepages to vol. 26 a. 30. Pp. 129-256 a. pp. 129-256. Fizeau & Foucault's paper: pp. 138-148 a. pp. 146-159, 2 folded engraved plates. Some scattred brownspots. First appearance of thispaper in which the authors demonstrated importent similarities between sound - and lightwaves, and that interference takes place between rays of light of different wavelenghts thus giving considerably evidence for the wave theory of light."By analyzing the white light source into simpler constituents by means of a spectroscope, Fizeau and Foucault were able to observe fringes produced by interfering light rays with a difference of travel equal to more than 7,000 wavelenghts, thus showing hat light waves, like sound waves, remain geometrically constant over a large number of periods. But light waves, because of… Leer más

1849. Paris, Bachelier, 1849. 4to. No wrappers. In "Comptes rendus hebdomadaires des séances de l’Académie des sciences", Vol. 29, No 4. With htitle a. titlepage to vol. 29. Pp. 65-96 (entire issue offered). Fizeau's paper: pp. 90-92. Stamps on title-page. Clean and fine. First printing of the paper in which Fizeau describes how he produced the first terrestrial measurement of the speed of light, using a rapidly rotating toothed wheel to break a light signal into continuous pulses whose speed could then be estimated. That was the most accurate measurement to-date of the speed of light. This method was later used by Albert Michelson."Fizeau was not satisfied merely with determining the relative velocities of light. He wanted to measure with some precision the absolute velocity. In 1849 he had conceived an ingenious mechanism that would enable him to achieve his goal: a large toothed wheel was spun rapidly about its axis, and a beam of light sent through the spaces between the teeth was reflected… Leer más

1859. Paris, Victor Masson, Imprimerie de Bachelier, 1859. 8vo. Contemp. hcalf, raised bands, gilt spine. Light wear along edges. Small stamps on verso of titlepage and on verso of plates. In "Annales de Chimie et de Physique", 3me Series - Tome LVII. 512 pp. and 4 plates. (The entire volume offered). Fizeau's paper: pp. 385-404. Some scattered brownspots. First printing of a highly importent paper in the history of physics, "It is less famous, for some reason, than the failure of Michelson and Morley to detect the aether drag, but NO LESS SIGNIFICANT. For it showed that the velocity of light increases in a medium according to the formula, v (1 - 1/n2), where v is the velocity of the medium, and n is the refractive index"(Gillespie in "The Edge of Objecticity" p. 427). Fizeau shows that the velocity of light is higher in water flowing in the direction of the beam than that of light propagating in the direction opposite the direction of flow. The paper offered is the full text of the research, there… Leer más

1851. Paris, Bachelier, 1851. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 33, No 13. With htitle and titlepage to tome 33. Pp. 329-360 (entire issue offered). Fizeau's paper: pp. 349-355. A stamp on erso of titlepage. Titlepage with faint brownspots. First appearance of this paper, the first announcment of Fizeau's results of his experiments with the velocity of light."It (the paper) is less famous, for some reason, than the failure of Michelson and Morley to detect the aether drag, but NO LESS SIGNIFICANT. For it showed that the velocity of light increases in a medium according to the formula, v (1 - 1/n2), where v is the velocity of the medium, and n is the refractive index"(Gillespie in "The Edge of Objecticity" p. 427). Fizeau shows that the velocity of light is higher in water flowing in the direction of the beam than that of light propagating in the direction opposite the direction of flow. The paper offered is the shorter announcement of… Leer más

1851. Paris, Bachelier, 1851. 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome 33, No 13. With htitle and titlepage to tome 33. Pp. (329-) 360 (entire issue offered). Fizeau's paper: pp. 349-355. A stamp on upper right corner of title-page and a perforated stamp in lower margin of title-page. Clean and fine. First appearance of this paper, the first announcment of Fizeau's results of his experiments with the velocity of light."It (the paper) is less famous, for some reason, than the failure of Michelson and Morley to detect the aether drag, but NO LESS SIGNIFICANT. For it showed that the velocity of light increases in a medium according to the formula, v (1 - 1/n2), where v is the velocity of the medium, and n is the refractive index"(Gillespie in "The Edge of Objecticity" p. 427). Fizeau shows that the velocity of light is higher in water flowing in the direction of the beam than that of light propagating in the direction opposite the direction of… Leer más