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                                            JANVIER, Antide (1751-1835). Des révolutions des corps célestes par le mécanisme des rouages. Paris: P. Didot, 1812.
4° (259 x 192mm). Half-title, engraved frontispiece and 8 folding plates by Leblanc. (Plates lightly spotted, text lightly and evenly browned.) Contemporary marbled calf, flat spine gilt in compartments, red morocco lettering-piece. Provenance: G. Bontemps (bookplate) – Léon Leroy (bookplate).
FIRST EDITION, revealing the continued efforts to solve the problem of celestial computation. Janvier, a watchmaker, first provides a description of a mechanism left unfinished by Christian Huygens at his death. 'To animate flatland, Galileo and the others [such as Janvier] constructed Jovilabes, nomogram-like computation devices that recounted orbits of Jupiter's satellites' (Tufte, Envisioning Information, p.98).
                                        
                                    4° (259 x 192mm). Half-title, engraved frontispiece and 8 folding plates by Leblanc. (Plates lightly spotted, text lightly and evenly browned.) Contemporary marbled calf, flat spine gilt in compartments, red morocco lettering-piece. Provenance: G. Bontemps (bookplate) – Léon Leroy (bookplate).
FIRST EDITION, revealing the continued efforts to solve the problem of celestial computation. Janvier, a watchmaker, first provides a description of a mechanism left unfinished by Christian Huygens at his death. 'To animate flatland, Galileo and the others [such as Janvier] constructed Jovilabes, nomogram-like computation devices that recounted orbits of Jupiter's satellites' (Tufte, Envisioning Information, p.98).
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