Subject Index 



Acceleration transducers, 86, 91 

 Air conductivity, 220 

 Air-equivalent chamber, 286 

 Alpha gauge, 22-23 

 Alpha-ray-sensitive transducers, 



alpha-ray Geiger counter, 287 

 based on gas ionization, 281-300 

 photoconductive, 264, 266-267 

 solid-state systems, 300-303 

 Ammonium dihydrogen phosphate, 



piezoelectric properties, 80 

 Atmospheric electricity transducers, 

 218-220, 223-225 



Ballisto-cardiograph, 63 



Barium titanate ceramics, piezo- 

 electric properties, 80 



Beckman Hygrometer, 145 



Becquerel effect, 170 



Beta gauge, 21-22 



Beta-ray-sensitive transducers, based 

 on gas ionization, 281-300 

 solid-state systems, 300-303 



Beta rays (see entries under Electron) 



Bimorph crystals (see Piezoelectric- 

 displacement transducers) 



Bismuth spiral for magnetic field 

 measurements, 196-199 



Blackening of thermal-radiation 

 transducers, 276-277 



Bolometers, for displacement 

 measurements, 72-74 

 for radiation measurements, 

 278-280 



Cables, noise originating in, 71 

 Callendar equation, 158 

 Capacitive transducers for measure- 

 ment of displacement, 66-72 

 humidity, 146-150 

 liquid level, 98-100 

 pressure, 104-105 

 surface charge or surface potential, 



227-229 

 temperature, 166-167 

 thickness, 14-15 

 Capacitors, 14-15, 66-72 

 differential, 67-70 

 fringe effect, 14-15, 66 

 serrated, 70 

 variable, 66-70 



change-of-area system, 69-70 

 change-of-distance system, 66-69 

 Cathodes in photoemissive systems, 



235-237 

 Charged -plate ion collector, 216 



31; 



