Transition from the table clock to pocket watch

The second problem of Watch evolution problems is escapement, the pendulum is huge, and the gravity effect for clock is very obvious; it can’t be slanted, so inconveniently to carry. At this time, Huygens used the hairspring replaced the original pendulum, thus forming a miniature clock that take movement as power resource and balance spring as regulating mechanism, which also provided condition for portable pocket watch. During eighteenth Century a variety of escapement were invented, in 1726 Gallo improved and perfected wheel escapement mechanism, until nineteenth Century, pocket watch has been widely spread, the modern mechanical watches in form is similar to the one in nineteenth Century.