Ehret Vers 1912
Reference : 4111
Bon état Plaquette agrafée , illustrée dun hors texte en couleurs et de douze gravures sur bois illustrant les douze signes du zodiaque . Couverture imprimée , tirage à petit nombre ( Carteret V - 143 ) Premier livre illustré par Daragnés . Poésie Illustrée - largeur/hauteur :14,5x19,5 cm - poid : 60 g - nombre de pages : Env 16 p. - langue : Français
L'Avenir du Passé
M. Franck Morant
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"THE COMET OF 1702. - MARALDI, G.F., DE LA HIRE, BIANCHINI, CASSINI, CASSINI LE FILS.
Reference : 45591
(1704)
(Paris, Jean Boudot, 1704). 4to. Without wrappers. Extracted from ""Mémoires de l'Academie des Sciences"". Année 1702. Pp. 101-134 and 4 folded engraved plates (celestial maps).
First printing of these 5 papers accounting the observations of the comet. Bianchini and Maraldi discovered the comet in the morning sky on April 20, 1702. The comet was a short distance above the horizon and was said to resemble a ""nebulous star"".An independent discovery was made by Maria Margarethe Kirch (Berlin, Germany on April 21, 1702 and by Philippe de la Hire (Paris, France) on April 24. The last observation of the comet was made by Bianchini and Maraldi on May 5, 1702.
Small 8vo. Cont. hcalf. Gilt back. Tear at upper part of hinge. IV,326 pp. Stamp on title.
"EULER, LEONHARD. - ON MAUPERTUIS' PRINCIPLE OF LEAST ACTION
Reference : 46426
(1752)
(Berlin, Haude et Spener, 1752). 4to. No wrappers, as issued in ""Mémoires de l'Academie Royale des Sciences et Belles-Lettres"", 1750, tome VI, Titlepage to the section. (3), pp. 520-532 (+) pp. 52-64 (Expose).
In 1751, Maupertuis' priority for the principle of least action was challenged in print (Nova Acta Eruditorum of Leipzig) by an old acquaintance, Johann Samuel Koenig, who quoted a 1707 letter purportedly from Leibniz that described results similar to those derived by Euler in 1744. However, Maupertuis and others demanded that Koenig produce the original of the letter to authenticate its having been written by Leibniz. Koenig only had a copy and no clue as to the whereabouts of the original. Consequently, the Berlin Academy under Euler's direction declared the letter to be a forgery and that its President Maupertuis could continue to claim priority for having invented the principle.Enestroem: 182.
(Paris, Mallet-Bachelier), 1868. 4to. No wrappers. In: ""Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences"", Tome 67, No 17. Pp. (813-) 852. (Entire issue offered). Janssen's paper: pp. 838-839. A few minor brownspots.
First apperance of of the paper in which Janssen announced the first observations of a Solar Prominence without Eclipse. ""Janssen and Sir Norman Lockyer independently and about the same time discovered the method of observing solar prominences and the limb of the sun through using a high dispersion spectroscope in order to project the bright hydrogen lines of the prominence spectrum on the much attenuated background of the solar spectrum."" (Shapley & Howarth ""A Source Book in Astronomy"", where this paper is translated on pp. 308-310).""This (the spectra of helium in the sun) was announced on the same day by the French astronomer Janssen, who was in India observing a total eclipse. As a result, the French government some ten years later struck a medallion showing the heads of both scientists.By that time, the two men had made a much more dramatic discovery at the same time, this time in cooperation. Janssen, studying the spectrum ofthe sun during the eclipse, had noted a fine line he did not recognize. he send a report on this to Lockyer, an acknowledges expert on solar spectra. Lockyer compared the reported position of the line with lines of known elements, concluding that it must belong to a yeat unknown element, possibly not even existing on the earth. He named the element, from the Greek word for the sun.""(Asimov).Parkinson ""Breakthroughs"" 1868 A.