1. One who works in a pit, as in mining, in sawing timber, etc. 2. (Mach.) The connecting rod in a sawmill; also, sometimes, a connecting rod in other machinery. PITOT'S TUBE Pi*tot's" tube`. (Hydraul.) A bent tube used to determine the velocity of running water, by placing the curved end under water, and observing the height to which the fluid rises in the tube; a k...