BAILLY JEAN SYLVAIN: (1736-1793) BAILLY JEAN SYLVAIN: (1736-1793) French Mathema…
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BAILLY JEAN SYLVAIN: (1736-1793)

BAILLY JEAN SYLVAIN: (1736-1793) French Mathematician, Astronomer and the first Mayor of the city of Paris. Bailly was guillotined for his participation in the Champ de Mars massacre. A rare and very clean A.L.S., Bailly, one page, 8vo, Chaillot, Paris, 3rd May 1788, to Monsieur Guillaumot, in French. Bailly addresses the present letter to Guillaumot, architect and intendant in charge of the King´s buildings and states in part ` Vous m'avez fait l'honneur de me mander, Monsieur, qu'à la fin d'avril, vous seriez en état de nous donner une réponse positive sur Ste Anne. On m'assure que vous êtes maintenant sûr qu'on peut faire usage de ce terrain en disposant les bâtiments sur les parties reconnues pour bonnes ou solides, je prends la liberté de vous demander la confirmation de cette bonne nouvelle. Si elle est vraie, comme je le crois, nous pourrons avoir incessamment le plaisir d'y voir les ouvriers…´("You made me the honour of telling me, Sir, that at the end of April you would be in a position to give us a positive answer on St Anne. I am assured that you are now sure that we can make use of this land by situating the buildings on the parts which are recognized as good or solid, I take the liberty of asking you for confirmation of this good new. If it is true, as I believe it is so, we may have the pleasure of seeing the workers incessantly there…") With address leaf in Bailly´s hand, bearing a red wax seal with his initials, in very fine condition. VG

1504 

BAILLY JEAN SYLVAIN: (1736-1793)

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BLAEU (Guillaume): Institution Astronomique de l'Usage des Globes et Spheres célestes & terrestres. Amsterdam, Jean and Corneille Blaeu, 1642. One volume. 15.5 by 20.5 cm. (18)-277 pages. Full contemporary basane spine with 4 raised bands, ornate caissons, double gilt fillet framing the boards. Picturesque old restoration of the upper cover, small leather tears on the second cover (not serious). Title page with a tear in the margin, with no missing text. Small light marginal wetness on a few leaves, two small paper tears in margins, with no missing text. Two parts have been interchanged in the binding, but the book is complete. 34 illustrations in the text, mainly of astronomical instruments. Lamp-ends and initials. First edition of the French translation of this important treatise, first published in Dutch in 1620, in three parts: the first, on the composition and parts of globes; the second, on Ptolemy's "improper" hypothesis that the earth is immobile; the third, on "the true hypothesis of N. Copernicus that the earth is mobile". Willem Jansoon BLAEU (1571-1638), Dutch astronomer and mathematician, was a master globetrotter, famous for improving cartography. In this work, Blaeu gives a detailed explanation of the different parts of a globe, followed by a series of almost 150 exercises, for both the celestial and terrestrial globe. Blaeu had worked on the island of Hven with Tycho Brahe, whose measurements enabled KEPLER to conceive the elliptical trajectories of the planets, and was a fervent supporter of the Copernican system. Rare book.