The SciencesFood in a Balloon, Pilot Valve, and moreBy Alexander Klemin, D.H. Killeffer, F.D. Mchugh on June 1, 1939AdvertisementABOUT THE AUTHOR(S)Recent Articles by Alexander KleminInstrumentation, Measurement, and ControlMust Flying be a "Racket"?Ideas in the AirRecent Articles by D.H. KillefferSoaps that Wash NothingPlastics TomorrowRecent Articles by F.D. MchughModern "Alchemy" in Iron and Steel