Great book well written. The author knows his subject very well. There is a lot of theory and drawing about the lever escapement which takes up the majority of the book. There are 4 sections and 20 chapters. Chapters 19 and 20 are devoted to the cylinder escapement which does give a lot of details but not enough for me i was disappointed. Overall it is a good treatise on 2 of the most used and popular watch movements in the world.
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