The Theory of Horology
by Charles-André Reymondin, Georges Monnier, Didier Jeanneret, Umberto Pelaratti · Swiss Federation of Technical Colleges (FET)
Swiss school textbook on horological theory: gear train calculations, escapements, the balance and hairspring, isochronism, lubrication, shock protection, automatic winding and complications. The theory text for the WOSTEP 3,000-hour watchmaker course. For learners going past hobby servicing, this is the rigorous engineering explanation of why movements work — the professional standard.
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