17 June 2008
[GALILEI, Galileo]. -- CASTELLI, Benedetto. Risposta alle opposizioni del S. Lodovico delle Colombe, e des S. Vincenzio di Grzzia, contro al trattato del Sig. Galileo Galilei, delle cose che stanno su l'acqua o che in quella si muouono ... Nella quale si contengono molte considerazioni filosofiche remote dalle vulgate opinioni. Florence: Cosimo Giunti, 1615.
8o (212 x 149 mm). Woodcut printer's device on title. (Some light browning and staining). Contemporary vellum. Provenance: Early ink stamp, of Alessandro Capponi (1683-1746), Italian book collector ("Libri medicina animi," ink stamp on title, C1, C8 and last page).
FIRST EDITION of Galileo's principal text on the controversy over floating bodies. Like several of his polemics of his period, it appeared under the name of a colleague, in this case his pupil and friend Castelli. This work was written as a reply to two attacks by Colombe and Grazia on Galileo's 1612 treatises on floating bodies (see lot 133). "Using the concept of moment and the principle of virtual velocities, Galileo extended the scope of the Archimedean work beyond purely hydrostatic considerations." Galileo's position involved philosophic principles, and was regarded as a challenge to the authority of Aristotle. Galileo in the present reply to his academic critics enlarged both the scientific reasoning behind his position and presented a vigorous philosophical defense of that position. In the second replying to Grazia, Galileo states that he made use of two basic principles, "that equal weights moved with equal speed are of like power in their effects, and that greater heaviness of one body could be offset by greater speed of another" (Stillman Drake). This copy contains the rare two additional leaves completing the errata and giving the registration and printer's device, not recorded by Cinti. Carli and Favaro 66; Cinti 51.
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