Ear, 272. Wireless telegraphy, 137; advance of, 145; receiver, 140, 141; syntonic, 143; transmitter, 138, _139_. Yale lock, _436_, _437_. Yellow spot, in eye, 251; yellow, in eye, 251. Spring balance for watches, 415. Gooch reversing gear, 65. Governors, speed, 67; of motor car, 105. Coal, as fuel, 15; gas, 394; gas plant, we observe.