• 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.