TechnologyRadio Notes, January 1927A Review and Commentary on the Progress in This Branch of Rapid CommunicationBy Orrin E. Dunlap on January 1, 1927AdvertisementABOUT THE AUTHOR(S)Recent Articles by Orrin E. DunlapNew Power Tube Has Economical Filament, Reflectors are Efficient and moreWanted--A Radio Fan's ParadiseHigh Speed Attained by Marconi Beam, Battery Receivers can be Electrified and more