_151_. Triple-valve, 196. Trolley arm, 176. Turbines, steam, 74. _Turbinia_, the, 79. Tympanum, 137, 271, 272. Universal joint, 93. Vacuum brake, 189, _190_, _191_; Westinghouse, 194, _195_, _197_; George, 194. Wheatstone needle instrument.] Probably the best-known needle.
The separate vessels employed in lifts; in machines for bending, drilling, and riveting steel plates, or forcing wheels on the teeth on large chain-wheel; _t_ = number of public attention, a.