A concise workshop manual that teaches the practical skills needed for producing, repairing, and regulating watches and related small machinery. It begins with essential arithmetic, geometry, and drawing techniques, surveys metals, alloys, heat treatments, and finishing processes, and gives guidance on healthful shop practices and precise hand manipulation. Extensive sections describe lathes, cutters, fixtures, measuring methods, and many small tools, followed by step‑by‑step procedures for cleaning, assembling, timing, and troubleshooting movements. The text mixes tested recipes and time‑saving makeshift repairs with instructions for making and testing parts, supported by numerous illustrations and an exhaustive index for quick reference.