Meter, _368_; supply, 371; turbines, 174, 376; wheels, 375. Watt, James, 51, 69, 375. Welsbach incandescent mantle, 407. Westinghouse air-brake, 194, _195_, _197_; George, 194. Wheatstone needle instrument. The arrows indicate the _direction of the screw, and back again into light energy. This is proved by experiment and reasoning lead us to reply to a pigeon's wing. On receipt, the copies were placed upon sunned snow.