Vacuum tubes which activate the mechanisms ...
To actuate, or to cause to move, or to bring into action, or to set in motion ...
The relay serves to actuate the dial mechanism of the clock.
The machines in these plants are largely driven by ac motors.
This initiates the operation of the governor mechanism.
The motors operate the caterpillar tracks.
A separate motor powers the hydraulic pumps.
All American passenger cars are powered with (or propelled by) 6 or 8-cylinder engines.
When the machine member is set (or put) in motion, ...
The rocket is propelled in the same way.
mettere in moto, avviare