[BUELFFINGER (or BUELLFINGER or BILFINGER), Georg Bernhard].

De Causa Gravitatis Physica Generali Disquisitio Experimentalis quae Praemium à Regia Scientiarum Academia promulgatum, retulit: anno 1728.

Two folding engraved plates. 1 p.l., 40 pp. 4to, modern wrappers. Paris: C. Jombert, 1728. First edition and very rare; OCLC records no copy in the U.S. Bülffinger (1693-1750), was professor of mathematics at Tübingen. He later was appointed professor of experimental and theoretical physics at St. Petersburg by Peter the Great. He wrote many scientific treatises. “These experiments conducted in St. Petersburg, were designed to check Galileo’s and Mariotte’s theories of bending. Büllfinger finds the latter theory better for explaining the experimental results. He also found that Hooke’s law was not borne out by the experiments and suggests a parabolic relation...where “m” is a constant to be determined experimentally.”–Roberts & Trent, Bibliotheca Mechanica, p. 55. Fine copy preserved in a box. Ex Bibliotheca Mechanica. ❧ Poggendorff, I, 189-90.

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