Harassed by continued crop losses under old methods of smudging crops, farmers have restored to modern scientific applications on a La Habra, Calif., citrus ranch. These "scientific windmills," motordriven blower contains a built-in air heater and provides bi-combination stages for varying weather conditions. Installation on a permanent concrete foundation on a citrus ranch was made according to California Institute of Technology figures determining natural wind drift as channel for shooting heated air. by Wide World Photos, Inc.