She had been attracted by the course on fluids given by Villat and he now advised her to go to Oslo to study with Vilhelm Bjerknes who had been appointed to the chair of applied mechanics and mathematical physics at the University of Oslo three years earlier. Bjerknes had published his most important work On the Dynamics of the Circular Vortex with Applications to the Atmosphere and to Atmospheric Vortex and Wave Motion in 1921 and at the time that Jacotin visited him he was working on a project to write a large textbook on theoretical physics which he hoped Jacotin would translate into French.
Siya had been attracted sa pamamagitan ng mga kurso sa fluids na ibinigay ng Villat at siya ngayon ipinapayo sa kanyang pumunta sa Oslo sa pag-aaral na may Vilhelm Bjerknes na had been hihirangin upang angkinin ang upuan ng inilapat mechanics at matematika physics sa University of Oslo tatlong taon na mas maaga. Bjerknes ay nai-publish na ang kanyang pinaka-mahalaga sa trabaho Sa dinamika ng pabilog puyo ng tubig sa mga aplikasyon sa himpapawid at sa Atmospheric puyo ng tubig at Wave Motion sa 1921 at sa oras na Jacotin bumisita sa kanya siya ay nagtatrabaho sa isang proyekto upang makapagsulat ng isang malaking aklat-aralin sa panteorya physics kung saan siya inaasam Jacotin ay isalin sa mga French.