Often when a particular topic arises such as for example, lock, drop, lift, run, cycloidal error, etc., I've noted David J. LaBounty, CMC FBHI refer to Goodrich and "The Modern Clock". I HAD to see. I HAD to read for myself. Only a hundred pages into it and I am stoked. Admittedly that's only a fifth of the book but if the book ended here, I'd feel my money well spent. I have a half dozen or more other books on practise and theory. Less than half way thru, already this is by far the best. One note however. This is not a beginner's book. This would not be a good first book. But after you've got several beginners' books and tore down a dozen or more movements - GET THIS book!