Throw-line. The travel of a piece, moved by an eccentric.
Thumb-nut. A nut so shaped that it may be screwed up or unscrewed by hand.
Tight. A term used to denote those parts of a plate or saw that are under undue tension, and prevent the other parts of the plate from lying flat.
Timber-planer. A wood-planing machine for thick work, usually having side heads as well as cutter bars.
Tire. The iron band surrounding a wheel rim.
Tit-drill. A drill having a point or teat, and employed to cut flat-bottomed holes.
Tool-post. The device employed in a slide-rest to grip the cutting tool.
Train. An arrangement of gear wheels in which there are more than two gear wheels employed.
Trammels or tram. A device for measuring distances too great to be measured by ordinary compasses.
Trip-hammer. A forging machine in which the helve or hammer holding beam is tripped by a revolving cam.