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Kruzenstern now entered the Corea Channel, and determined the longitude of Tsusima, obtaining a difference of thirty-six minutes from the position assigned to that island by La Pérouse. This difference was subsequently confirmed by Dagelet, who can be fully relied upon.
For the more effectual prosecution of the design, several gentlemen were appointed to go out upon the voyage, who were known to excel in different departments of science and literature. Mr. Dagelet went as astronomer; M. de la Martiniere, P. Recevour, and M. de la Fresne, as naturalists; and the Chevalier de Lamanon and M. Monges, junior, as natural philosophers.
Marine watches, and other instruments, were provided; and M. Dagelet was particularly directed to make observations with M. Condamine's invariable pendulum, to determine the differences in gravity, and to ascertain the true proportion of the equatorial to the polar diameter of the earth.
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