In a general manner the apparatus provided an analysis of a motion on the basis of the sequence of its elemental aspects.
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Here Janssen realized one of the operations necessary for cinematography, which was invented twenty years later, and which required, besides analysis, the synthesis of images. Even in fields in which he was not a specialist, Janssen displayed astonishing insight. In , in a course designed for architects, he set forth the Pinciples of effective illumination: At the same time he recommended the soundproofing of apartment buildings:. Since the increasing value of space in our big cities has imposed the necessity of joining, under the same roof, a large number of families.
On this point, almost everything remains to be done [ ibid. Janssen had acquired an international reputation from the start of his scientific work. He was elected to the Academy of Sciences in and to the Bureau of Longitudes in and was also a member of the academies of Rome, Brussels, St. Petersburg , Edinburg, and the United States. He carried out his duties as director of the Meudon observatory until his death, which was the result of a pulmonary congestion. It is not surprising that Janssen was able to accomplish so much that he undertook. Between and Janssen published approximately items, almost all of which were reprinted in Oeuvres scientifiques de Jules Janssen , H.
The first volume, which he himself wrote, is devoted to the establishment of the Meudon observatory. A list of biographies and obituaries is included in the Oeuvres scientifiques , II, The most important accounts are G. Dubuisson, Inauguration de la statue de Jules Janssen Paris, Cite this article Pick a style below, and copy the text for your bibliography. Retrieved December 18, from Encyclopedia.
Then, copy and paste the text into your bibliography or works cited list. Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia. In —58, in Peru, he worked on the determination of the magnetic equator; in the Azores he examined magnetic and topographical conditions; and in Japan and in Algeria he observed the transit of Venus. Janssen accompanied various solar eclipse expeditions, notably that to Guntur, India, in , where he devised a new method of studying the solar prominences spectroscopically and discovered, almost simultaneously with J.
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Soon, however, there were financial difficulties. It became necessary to use funds budgeted for research for the completion of the buildings, a task that required twenty years.
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The staff was insufficient moreover—until there were only two astronomers. Nevertheless Janssen was able to endow the observatory with two large instruments: For the spectral investigation of gases, he also set up a large laboratory with a steel tube sixty meters long, closed by thin transparent plates and capable of supporting a pressure of atmospheres. Composed of a selection of exposures made between and , it summarized the history of the surface of the sun during these years.
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Janssen employed a photoheliograph of his own design. It was not possible to make all the solar observations at Meudon. Janssen was well aware of the advantages of observing at high altitudes. His age and his lameness did not allow him to make the climb on foot, especially at that season. Thus he invented a conveyance to be borne by porters. It consisted of a seat fixed under a horizontal ladder: The ascent, which lasted thirteen hours, was as exhausting for Janssen as for his porters.
But the instruments were installed immediately; and the observations, which he was able to make during the whole of the third day, were sufficient to provide a solution to the problem under study. The dark rays were either nonexistent or so weak that it could be deduced that they would not exist for an observer at the limit of the terrestrial atmosphere. Encouraged by this experiment, Janssen repeated it in , this time at the summit of Mont Blanc 4, meters. The measurements confirmed the earlier results. Despite the difficulties encountered the caravan left Chamonix on 17 August but did not arrive at the summit until 22 August , Janssen decided to erect an observatory there for conducting studies in physical astronomy, terrestrial physics, and meteorology.
By July he had gathered the necessary funds and equipment, and two years later the observatory was completed. The initial stages were completed at Meudon, where a fifteen-ton building had been set up, which was then transported to Mont Blanc in pieces. Each piece had to weigh less than thirty kilograms so that it could be carried by porter to the summit. Although his observatory did not withstand the rigors of the weather, Janssen had set a splendid example by his energy and unfailing courage. In the annual Mont Blanc expedition set out to determine the solar constant.
Janssen had broken a leg on the staircase of the large dome at Meudon and was unable to manage the climb. He nevertheless arranged to be carried on a stretcher to Chamonix in order to organize the work of his collaborators.