A mechanical watch does not use batteries or electricity. It is powered entirely by the raw kinetic energy of a tightly coiled steel ribbon (the mainspring). If you attached hands directly to this spring, they would spin wildly out of control until the spring unwound in seconds. The genius that forces this violent energy to release in perfect, measurable ticks is the Escapement. This book breaks down the absolute heart of mechanical horology. The escapement is an ingenious, microscopic braking system consisting of an escape wheel and a pallet fork. We examine the physics of how the swinging balance wheel physically forces the pallet fork to lock and unlock the gear train, allowing the massive power of the mainspring to escape only one microscopic tooth at a time. We explore the use of frictionless synthetic ruby jewels to prevent the rapidly sliding metal components from wearing each other into dust, and the obsessive Swiss micro-engineering required to ensure the system beats exactly 28,800 times an hour. Master the rhythm of the machine. Discover the brilliant, ticking mechanical dam that perfectly mathematically divides kinetic force into the human concept of a second.