INDEX 



Speech and Hearing in Com- 

 munication, 148 

 Standing waves, 49, 50, 51, 52; 



patterns, 51 

 Stop watch, 74 

 Submarines, 17, 109, 111, 112, 



113 

 Supa, Michael, 132, 133, 143 

 Suppressor mechanism, 64-65 

 Surface tension, 53, 147 

 Surface waves, 53; use of, 54 



Tape recorder, 46, 47, 48, 50; 

 reversed playback technique, 



62-64, 66 

 A Textbook of Radar, 147 

 Time, 36; measurement of, 



149 

 Titanic, 108 



Underwater hearing equip- 

 ment, 20-21, 22 



Underwater loudspeaker, 111 



Underwater sounds, 20, 149; 

 discrimination, 110; energy 

 of, 25; frequencies, 112 



Underwater sound devices, 

 109, 110, 111 



Vacuum, 40 

 Vampire bats, 85 

 Venus, 120 

 Violin, 49 



Vision, 22; in water, 19. See 

 also Blindness, Eyes, Sight 

 Voltmeter, 47 



Walter Reed Army Institute of 



Research, 29 

 Washington, L., 150 

 Water, 18, 97, 116; clear, 19; 

 dark, 18; sound in, 25; tur- 

 bid, 18 

 Water beetles, 80 

 Water waves, 53, 69, 80 

 Wave lengths, 25, 26, 29, 41- 

 42; frequency, 72; under- 

 water, 112 

 Wave motions, 9; property of, 



36, 69 

 Waves: electromagnetic, 107- 

 8;light, 53,70, 80; radio, 18, 

 35-36, 122; scattering of, 

 80; seismic, 149; sine, 36, 

 38; sound, 18, 53, 149; sur- 

 face, 53; use of, 17; water, 

 53, 69, 80 

 Whales, 18, 148; brains, 20; 

 hearing, 19; noises of, 20 

 Whirligig water beetle, 53-56 

 Whispering bats, 85, 87, 95 

 Witcher, C. M., 150 

 Woods Hole, Mass., 22 

 Woods Hole Oceanographic 



Institution, 22 

 World War 11, 111, 120, 121, 

 149 



X-rays, 119 



Zahl, P. A., 150 

 Zoology, 10 



156 



