D’Alembert and Hydrodynamica

“One can see through various memoirs that can be found in the volumes of the science academies in Paris, Berlin, or Petersburg, how the principle of conservation of living forces eases the solution of many problems in Dynamics; we even believe that there as been a time when one would have been most embarrassed to solve many of those problems without using this principle.”

D’Alembert wrote in 1757 on Hydrodynamica.