Noun
A modification of the gyroscope, consisting essentially of a fly wheel fixed inside a rigid case to which is attached a thin flange of metal for supporting the instrument. It is used in studying the dynamics of rotating bodies.
Source: Webster's dictionaryBy 1880, William Thomson (lord Kelvin) tried to propose a gyrostat (tope) to the British Navy. Source: Internet
The first gyrostat was designed by Lord Kelvin to illustrate the more complicated state of motion of a spinning body when free to wander about on a horizontal plane, like a top spun on the pavement, or a hoop or bicycle on the road. Source: Internet