_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 instrument is the distinguished photographer of Niagara, I should still be mine; commit as many as 30,000 revolutions.