A contemporary look at Hermann Hankel's 1861 pioneering work on Lagrangian fluid dynamics Uriel Frisch, Gérard Grimberg and Barbara Villone Eur. Phys. J. H, 42 4-5 (2017) 537-556 Published online: 15 December 2017 DOI: 10.1140/epjh/e2017-80038-2