Making this "braking" system work without a battery was thought to be impossible.
He called his theory "". To explain it, he used the analogy of a bicycle coasting down a hill: gravity provides the energy (like a mainspring), but a pacemaker sets the speed, and the rider uses brakes to stay in sync. 2. A 28-Year Struggle (1977–2005) buy seiko spring drive
Unlike mechanical watches that use a ticking "escapement," the Spring Drive uses a . What is Seiko Spring Drive? | WATCH EDUCATION Making this "braking" system work without a battery