Trundle. A gear-wheel having rungs in place of teeth.
Trying-up. A term usually employed to indicate that the work is accurately done or fitted.
Try-square. A tool having a rectangular back, and a blade whose edges are a right angle to the edges of the back.
T Slot. A slot or groove, shaped to receive a bolt head and prevent it from turning when the nut is screwed up.
Turnbuckle. A socket that receives and holds the ends of two rods and permits either to be revolved independently of the other or the socket to be revolved without revolving either rod.
Turret-lathe. A lathe in which a revolving head or turret carries the cutting tools.
Tuyère (twē′ar). The nozzle through which air is forced into a blacksmith’s fire, a furnace or a cupola.
Twin-mills. Milling cutters that are used in pairs, and have teeth on their side faces as well as upon the circumference.
Twist-drill. A drill having a spiral flute along it.
Twist-hammer. A sawmaker’s hammer having its two faces parallel, so that by turning it over in the hand its marks will be in opposite directions.