324 



SUBJECT INDEX 



Ultraviolet-sensitive transducers, 

 photocounters, 262 

 photoemissive, 234-238 

 photogalvanic, 271 



Vacuum gauges, 109-117 



alphatron, 114 



ionization, 112-117 



Philips-Penning type, 116-117 



Pirani, 109-112 



radioactive type, 114—115 



thermal systems, 109-112 



thermionic, 112-114 

 Variable differential transformer, 48 

 Variable -reluctance phonograph pick- 

 up, 65 

 Velocity distribution of ions or 

 electrons, 218, 221-223 

 Velocity transducers, 62-66, 91-94 



induction type, 92-93 



measurement of s and t, 93-94 



Verdet constants, 212 

 Vibrating capacitor, 228-229 

 Vibrating-string transducer, 83 

 Villari effect, 56 



Voltage dividers for photomultipliers, 

 256-259 



Water content (see Humidity trans- 

 ducers) 

 Water-drop collector, 224 

 Wilson plate, 227 

 Wire strain gauges, 31-36 



X-ray gauges, 19-21 

 X-ray-sensitive transducers, based on 

 gas ionization, 281-300 



photoconductive, 264 



photogalvanic, 271 



solid-state systems, 300-303 

 X rays, mass absorption coefficient, 20 



