Euler E260: Attempt at a theory of the friction of fluids | English translation | OMH v1.0

English translation of “Tentamen theoriae de frictione fluidorum” by Leonhard Euler (Eneström E260), titled “Attempt at a theory of the friction of fluids.” Prepared for Open Math Heritage with OpenAI-assisted translation, mathematical transcription and LaTeX typesetting. OMH v1.0 is a machine-assisted draft that has undergone a full, fresh AI-assisted technical audit of source coverage, translation, formulas, tables and figures where present, and rendered output. This is not a claim of human scholarly review or certification of the historical mathematics. Version 2 is reserved for a fully reviewed edition. Original publication: Novi Commentarii academiae scientiarum Petropolitanae, vol. 6 (years 1756/1757, printed 1761), pp. 338–388, Plates VI–VII with nine figures; includes the appendix beginning at §105. Sources: https://scholarlycommons.pacific.edu/euler-works/260/. No explicit scan-specific Creative Commons license was verified; open access is not treated as a license grant. The original historical text is public domain by age; no publication license is assigned here to the new translation or editorial notes.