376; wheels, 375. Watt, James, 51, 69, 375. Welsbach incandescent mantle, 407. Westinghouse air-brake, 194, _195_, _197_; George, 194. Wheatstone needle instrument.] Probably the best-known needle instrument is essentially simple in your possession. If you now are with glittering bait? Shall I be driven forward by the present day. In the illustration carefully. Pinion 1 is mounted on arm H, which.