The Astronomer Jules Janssen: A Globetrotter of Celestial Physics

ISBN-13: 9781489992451 / Angielski / Miękka / 2014 / 222 str.

Francoise Launay

Opis

A physicist and an inventor, Jules Janssen (1824-1907) devoted his life to astronomical research. He spent many years traveling around the world to observe total Solar eclipses, demonstrating that a new era of science had just come thanks to the use of both spectroscopy and photography, and persuading the French Government of the necessity of founding a new observatory near Paris. He became its director in 1875. There, at Meudon, he began routine photographic recordings of the Sun surface and had a big refractor and a big reflector built. Meanwhile, he also succeeded in building an Observatory at the summit of Mont-Blanc.The story of this untiring and stubborn globe-trotter is enriched by extracts of the unpublished correspondence with his wife. One can thus understand why Henriette often complained of the solitude in which she was left by her peripatetic husband: "There are men who leave their wives for mistresses; you do it for journeys " ...Basking in the glow of his success, Janssen was able to undertake the construction of the great astrophysical observatory of which he had dreamed. It was at Meudon that he had it built.

Spis treści

Preface.- Acknowledgements.- Dedication.- Foreword.- Childhood and education.- Spectral analysis and telluric lines.- Janssen and the solar flames: the key eclipse of 1868.- The eclipse of 1870, balloons and patriotic missions.- Janssen and the Sun in majesty: the eclipse of 1871.- Janssen and cinema: the transit of Venus of 1874 and the revolver photographique.- The foundation of the "Paris Observatory for Physical Astronomy"... located in the Meudon estate.- Janssen, the photographic technician.- From Caroline Island to Washington.- Janssen and Edison’s phonograph.- The saga of the observatory on the summit of Mont Blanc.- Literary salons and educational problems.- Janssen and communication.- Epilogue.- Chronology.- Bibliography.- Index.

O autorze

Françoise Launay spent her whole career as a research engineer at the Meudon Observatory, where she was the technical head for a large spectrograph, installed in part of the Château’s outbuildings, in the very location where Janssen carried out his laboratory experiments. She has now joined the history team at the Paris Observatory as an associate researcher, and she devotes herself to discovering unpublished material that documents the lives and work of individuals involved in astronomy, no matter whether they used, conceived, or constructed observational instruments.

Blurb

Every aspect of the personality of Janssen (1824—1907) – that D’Artagnan of science, this bard of the Sun, and this audacious master builder – is covered here by Françoise Launay, his attentive and equally erudite biographer.

A physicist, inventor and builder, Janssen was guided by his energy and curiosity. His research followed two directions: on the one hand the atmospheres of the Earth and the Sun, and on the other, two techniques: spectroscopy and photography.

Among his numerous voyages across the globe, he went to Japan in 1874 to follow the transit of Venus in front of the Sun, the same year in which he invented his famous photographic revolver, which was, in truth, a great technical success.

To observe the Sun during total eclipses he traveled to the Indies in 1868, to Oran in 1870 (escaping from besieged Paris by balloon!), returned to India in 1871, left for Siam in 1875 and, in 1883, for an island in the Pacific.

One can thus understand why Henriette often complained of the solitude in which she was left by her peripatetic husband: “There are men who leave their wives for mistresses; you do it for journeys!” ...

Basking in the glow of his success, Janssen was able to undertake the construction of the great astrophysical observatory of which he had dreamed. It was at Meudon that he had it built.

From the Preface by Jean-Claude Pecker