Screw-Thread Cutting by the Master-Screw Method Since 1480

The screw thread is one of the most important mechanical inventions in human history: a simple helical ridge that holds together the modern world. This rigorous historical study traces the master-screw method of thread cutting from its earliest documented form in a 1483 drawing through to innovations of the early 1930s. Battison, a curator at the Smithsonian, doesn't merely catalogue inventions, he reconstructs the thinking behind them, showing how craftsmen solved the seemingly impossible problem of cutting threads precise enough to power steam engines, textile mills, and eventually the entire industrial age. The book examines specific instruments and the craftsmen who built them, including Emanuel Wetschgi and other names lost to standard histories of technology. What emerges is a deeper story about how incremental mechanical refinements accumulated into revolutionary change. This is not a casual read; it's a specialist's document that will reward engineers, historians of technology, and anyone fascinated by the hidden mechanics beneath industrialization.