from The Century Dictionary and Cyclopedia
- n. That element of the mechanism in a Corliss valve-gear by which the valve-stem is released from the rod which actuates it, permitting the valve to close suddenly by gravity or a spring or both. The trigger is released by a push or pull from a rod connected to the governor of the engine, whereby the speed is made to determine the point at which the trigger is pulled, and the admission of steam cut off.
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