The gyroscopes hummed in their castings, and the motors creaked.
They even were able to keep sun-time and tell the seasons, by means of gyroscopes!
But the two gyroscopes must revolve in opposite directions for a reason to be given presently.
It is such a balanced top as this that we must call to our aid in explaining the action of Mr. Brennan's gyroscopes.
Our diagram 2, ...