Watt Regulator demonstrates
absoluteness of the rotational
motion. Rotational velocity that causes centrifugal force is inherent property of the space
regardless any spectator, so
what is the reference for ω:
a = ω² · r
Watt regulator is allegedly the
first automatic control device
used to make torque of steam
engine constant regardless the
pressure in the boiler in pretty
wide range. Torque is:
T = μ · (2 · m) · ω² · r
The clocks with springs also
have some sort of automatic
regulation to keep ticking
constant, this regulation was
invented by Hooke in 1675. It is 3D: click it with mice
to rotate and roll middle button to zoom.