Rules and practice for adjusting watches
A 1920 technical manual by Walter J. Kleinlein, printed in Boston by the Hooper Printing Co., instructing watchmakers and repairers in adjusting watch movements to position, temperature, and isochronism. The plates are numbered line diagrams of a watch case seen face-on, with crossed axis lines, concentric hairspring coils, and small lettered arrows pointing to balance parts, offering designers clean circular schematics, dashed centerlines, and figure captions on toned paper.
