Principal theory of machines
According to Jacobi, a treatise with this title was read to the Berlin Academy on February 26, 1756. According to St. Petersburg Academy records, it was presented to that Academy on March 8, 1756.
Original Source Citation
Novi Commentarii academiae scientiarum Petropolitanae, Volume 8, pp. 230-253.
Opera Omnia Citation
Series 2, Volume 17, pp.136-153.