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[HÉLIE (Félix)]. ARTILLERY EXPERIMENTS CONDUCTED IN LORIENT, Using Ballistic Clocks. Paris, Imprimerie Royale, 1847. In-4°, cherry-colored shagreen, with fillets and scrolls framing the covers and the gilded, crowned letters “AO” in the center; smooth, decorated spine; blue silk endpapers; gilt edges; modern slipcase. Interesting research by mathematician and ballistician Felix Hélie, aimed at precisely measuring the initial velocity of artillery projectiles using a pendulum. A superb gift copy, bound in a rich binding bearing the coat of arms of Antoine d’Orléans, Duke of Montpensier (O.H.R., pl. 2590, unknown maker).
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