![American Innovation: Merritt Burt’s Safety Pinion: Introduction (Part 1) img](https://blog.pocketwatchdatabase.com/wp-content/uploads/2024/05/DSC07857-3-1024x1024.jpg)
National Watch Company (Elgin) B.W. Raymond #829 Marked "Burt's Patent" "Mainspring Events" The large mainspring that serves as the power source for a mechanical watch movement can also become a violent adversary when it breaks, releasing a destructive shock throughout the delicate watch train. As...