Of current interest: Scientists talk coast-to-coast by bouncing voices off the moon

THE “EAR” of the most sensitive voice radio receiver yet built is this horn-shaped antenna at the space communication research facility of Bell Telephone Laboratories in Holmdel, N.J. The cab at the small end of the horn houses the radio receiving circuitry and a ruby maser amplifier refrigerated to −456 F. The antenna, 50 feet long, is rotated by the upright wheel. It also rotates about the base so that it will be able to track fast-moving satellites anywhere in the sky.