22 - DELISLE DE LA DREVETIÈRE (Louis-François). *The Discovery of Longitudes with An Easy Method for Navigators to Use It Today*. Paris, André Cailleau, 1740. One in-12 volume, in period morocco leather, spine with 5 raised bands, gilt edges. (2) ff., 80 pp., 1 plate, (2) ff.

DELISLE DE LA DREVETIÈRE (Louis-François). *The Discovery of Longitudes with An Easy Method for Navigators to Use It Today*. Paris, André Cailleau, 1740. One in-12 volume, in period morocco leather, spine with 5 raised bands, gilt edges. (2) ff., 80 pp., 1 plate, (2) ff. A rare first edition, complete with the fold-out plate illustrating the revolutions of the moon during the tropical year. Delisle de la Drevetière’s proposed theory was submitted that same year to the Royal Academy of Sciences and examined by Jacques Cassini and Grandjean de Fouchy, who expressed serious reservations regarding its practical application to navigation…