INDEX 



Radar System Engineering, 



149 

 Radioactivity, 149 

 Radio waves, 18, 35-36, 122 

 Rayleigh scattering, 125 

 Reflection, 75-77; angle of, 



77; specular, 69, 77 

 Reinforcement, 44 

 Reverberations, 44, 45, 47, 55, 



57, 113. See Echoes 

 Ridenour, L. N., 149 

 Ripple tank, 49, 52, 69, 73 

 Rummell, J. A., 149 



Scallops, 147 

 Scattering, Rayleigh, 125 

 Schevill, Barbara Lawrence, 



22; William, 22, 23, 25, 99 

 Sciences, 26-27, 56, 132; inte- 

 gration, 10 

 Science Study Series, 54 

 Scientific American Magazine, 



148 

 Scientific history, 32 

 Scientific theory, 32-33 

 Seismic waves, 116-17, 149 

 Seismograph, 117, 118 

 Sense extenders, 51 

 Sense of obstacles, 131-40 

 Sense organs, 36, 54, 55, 56, 



133, 147. See also Antennae, 



Ears, Eyes, Hairs, Skin 

 The Senses, 147 

 Shadows, 42 

 Sight: wave lengths, 130. See 



also Eyes and Vision 

 Sine waves, 36, 38 

 Skin, 133; pressure theory, 



133-34 

 Soap Bubbles and the Forces 



Which Mould Them, 54, 



147 

 Solids, 40, 116 

 Sonar systems, 18, 107-8, 



112-20; bats, 148; birds. 



148; discrimination prob- 

 lem, 109-10; Doppler effect, 

 113-16; echolocation: ice- 

 bergs, 108-9, ocean bot- 

 toms, 110, submarines. 111; 

 electronic, 149; frequencies, 

 111-14, constant, 113-14, 

 rapid, 112-13; marine life, 

 110-11; natural, 148 

 Sound: airborne, 19; corners, 

 42-43, 130; discrimination 

 problem, 104-5; existence 

 of, 40; frequencies, 38, 41, 

 in bats, 29-31, 84-87, high, 



29, low, 108, in porpoises, 

 25-26; indoors, 46-48; in- 

 tensity, 45; marine animals, 

 20, 147; multiple reflections, 

 44; nature of, 9, 41; orienta- 

 tion, 30, 148; outdoors, 46- 

 47, 48; pressures, 44; propa- 

 gation, 149; reflections, 44, 

 75-77; scattered, 70; trans- 

 mission in fish, 20; under- 

 water, 20, 149; use of, 19, 

 118, 147; velocity, 44-45, 

 in air, 65, measurements, 

 73-75, in sea water, 111, in 

 water, 19, 24-25; wave 

 lengths, 41-42, in water, 24, 

 25 



Sound boundaries, 19-20, 40, 



97 

 Sound-detecting equipment, 18, 



19, 107-8, 112-20 

 Sound detection, 140-43 

 Sound energy, 19-20, 30 

 Sound-generating devices, 150 

 Sound theory, 134 

 Space, 40 

 Spallanzani, Lazzaro, 27-29, 



30, 32, 87, 88, 108 

 Spallanzani's bat problem, 29- 



30, 109 

 Specular reflection, 80 

 Speech, 49, 50, 148 



155 



