00577    a2200133   4500003000500000005001700005040000900022082001400031100001600045245002800061260002600089300001300115505031500128Nust20230621084528.0  cNust  a384.5,ECC  aW.H. Eccles  aWireless /cW.H. Eccles  aLondonbThortonc1933  a250pages  aWaves (Page-7), Early Spark Telegraphy (Page-42), Syntonic  Spark Telegraphy (Page-64), Continuous Waves (Page-97), Beam Transmission (Page-121), The Triode (Page-138), The Triode Revolution (Page-163) Some Modern Receiving Apparatus (Page-186), Progress of Recent Years (Page-214), The Atmosphere(Page-235).