A review on the physiology of Insulin like Growth Factor-I (IGF-I) ... by Debnath, Surajit / Advances in Environmental Biology.
The spring piston airgun generates power using a powerful spring-loaded piston that is housed within a compression chamber. Cocking the gun (using a break barrel, side lever, or under lever mechanism) causes the piston assembly to compress the spring. When the spring is released it pushes the piston forward compressing a column of air in the chamber behind the pellet.
Spring Drive is our unique automatic watch with one-second-a-day accuracy. It is the only watch movement in the world that is powered by a main spring and has a regulator without an escapement; it is a watch that combines the beauty of the mechanical watch with the precision of electronic timekeeping.