نبذة مختصرة : We offer to the readers an article by Antoni Raabe, an Assistant of the Chair for Mechanics of the University of Lviv, which was to be published in the \textit{Scientific Notes\ldots} of the Lviv University in 1940, however, the journal never appeared in print (see below). The author's texts based on the manuscripts in Ukrainian and French are reproduced with the spelling and style preserved. The article may be of interest from both historical and methodological point of view
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