SUBJECT INDEX 



665 



Spectrometers. See Mass spectrometers. 

 Spectrophotometer, 353, 42G-7 

 Spherical aberration. See Aberrations. 

 Spirogyra, viscosity, 121-2 

 Stable isotopes, accomplishments, 594- 

 8 



accuracy of measurements, 586-94 



apparatus for detecting, 574-8 



applications, 566-71 



calculation of results, 583-6 



gas analysis, 570-1 



interfering particles, 579-81, 592-3 



measurements, 581-3 



methods, principles, 562-6, 572-86 



natural concentration, 562, 589 



permissible dilution, 590 



jjreparation of samples, for analysis, 

 578-81 



quantitative analysis, 568-70 



relative advantages, 564-6 



size of test samples, 590 



sources, 571-2 



standard samples, 593 



synthesis of compounds, 572-3 



theory of measurement, 563-4 



as tracers, 561-98 

 limitations, 586-94 

 Staining, for infrared microscopy, 352 



optical, 360-1 

 Standard deviation, 624-5 

 Standards, in calorimetry, for heat of 



combustion, 195 

 Standard units of measurements, 28-29 

 Statistical methods, 29-31 



irradiation data, 484-6 

 Statistics, of counting, 623-6 

 Stokes' law, 1 12-4, 274 

 Stopping powers, for electrons, tissue 

 and air, 543-5 



for neutrons, 549-50 

 Sulfur, isotopes, 562, 596 

 Sulfur ^^, measurement, 621-3 

 Supersonics. See Ultrasonic vibrations. 

 Survey meters, 642-3 

 Synchrotrons, 455 

 S\Tithesis, of isotopic compounds, 572- 



3 

 Szilard-Chalmers process, 607 



Temperature, importance in biophysics, 

 167-71 



low, sources, 218-21 



measurement by radiation, 162-5. 

 See also Radiometers. 



miscellaneous measuring devices, 

 165-7 



optimum for deliydrating frozen 

 materials, 223-4 



rise during ultrasonic exposure, 333-5 



scales, 132-3 



surface, 152-3 

 Thermal effects of ultrasonics, 333-5 

 Thermistors, 156-7 

 Thermocouples, applications, 149-53 



calibration, 147-8 



calorimetry, 153-4 



circuits, 144-7 



general precautions, 141-3 



limitations, 154 



for surfaces, 150-53 



theory, 143-7 

 Thermodynamics, osmotic pressure. 



45, 55 

 Thermoelectric force, 143 



measurement, 144-8 

 Thermoluminescence, 165 

 Thermometers, alcohol, 134-5 



Beckmann differential, 136-7, 139 



l)imetallic strip, 166-7 



calibration, mercury-in-glass, 138-40 



clinical, 137, 139 



comparisons, 152 



Kata, 199-200 



liquid-in-glass, 140 



maximum-minimum, 138 



mercury-in-glass, 135-6 



miscellaneous, 165-7 



rectal, 149, 161 



lesistance. See Resistance thermom- 

 eters. 



thermoelectric, 141-154. See also 

 Thermocouples. 

 Thermopiles. See Thermocouples. 

 Thermoscopes, 1 67 

 Time constant, 255 



