Its automatic inlet valve, which means it doesn't operate mechanically.
It was an old-fashioned drain without a mechanically operated stopper.
They didn't need the field for that, their catapults and spear-throwers being mechanically operated.
Limit switches may be directly mechanically operated by the motion of the operating lever.
Signals or points located some distance away from the signal box are sometimes electrically rather than mechanically operated.
In addition, two other computers provide a connection between the mechanically operated parts of the rudder and the fly-by-wire system.
A mechanically operated bellows pumped oxygen into the sealed chamber.
The bike is completely mechanically operated as there are no hydraulics on the bike.
Mechanically operated brakes using a Girling system were fitted.