Rontgen schneider (3 résultats)

Etat : VG. Leipzig 1886. In German. Octavo, pp. 165-213 with 7 figures on one plate, extracted from Annalen der Physik und Chemie, Band XXIX and rebound in later wraps. VG plus.

Leipzig, Barth, 1888. Orig. printed wrappers. Offprint from "Annalen der Physik und Chemie." pp. 531-551. First edition in the scarce offprint.

Ann. Phys., 3. Folge, 29. - Leipzig, Verlag von Johann Ambrosius Barth, 1886, 8°, VIII, 680 pp., nebst 5 Figurentafeln, Halbleinenband d.Zt.; feines Expl. Erstrdruck! Röntgen's second "assistant was Jakob Schneider (1861-1924), who came from the village of Lich close to Giessen. Schneider worked for Röntgen from 1884 till the end of 1887. He got his PhD in 1886 with the dissertation on the compressibility of saline solutions [Über die Compressibilität von Salzlösungen]. It was a topic on which Röntgen published a series of four papers together with Schneider in the years 1886, 1887, and 1888. All experiments are about the physical properties of fluids. Schneider left because he had accepted a temporary job as a teacher at the "Realgymnasium" (Gymnasium with a focus on modern languages] in Mainz. However, a year later Röntgen asked Schneider to help him with the calibration of the instruments for his experiment on the compressibility of carbon disulphide, benzene, sulfuric ether, and some different alcohols. By that time. Röntgen had moved to Wurzburg, but Schneider sacrificed his Christmas holidays to assist his mentor again. Röntgen had started with his experiments on the influence of pressure on the viscosity of fluids already in May 1880. However, his work came to a halt as he did not have the means at his institute to buy the necessary equipment. He needed a Caillctet pump to reach 1000 Atm. necessary for condensing gases. The French physicist Louis-Paul Cailletet (1832-1913) invented this pump with which he had succeeded in producing droplets of liquid oxygen. Nevertheless, Röntgen decided to publish the data he had, because Emil Warburg, who had done similar experiments, had asked him what his findings were. Röntgen had found a decrease in the viscosity of water when the pressure increased. Another problem with these experiments was the requirement to keep the temperature at a fixed level during the measurements of the compressibility. Every time the temperature of the water bath lowered, it took too long before the required temperature was reached again. Because of this instability, the measurements by Röntgen and his assistant Schneider did not have the outcomes they were looking for. Röntgen explained the situation to the University Senate in a letter of 26 October 1885. (.)." Gerd Rosenbusch, Annemarie de Knecht-van Eekelen: Wilhelm Conrad Rontgen. The Birth of Radiology (2019), pp.40-43.…