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5. The dew-point hygrometer

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© 2019 University of Toronto Press, Toronto

© 2019 University of Toronto Press, Toronto

Chapters in this book

  1. Frontmatter i
  2. PREFACE TO THE THIRD EDITION v
  3. PREFACE TO THE SECOND EDITION vi
  4. PREFACE TO THE FIRST EDITION vii
  5. CONTENTS ix
  6. I. INTRODUCTION: PROPERTIES OF METEOROLOGICAL INSTRUMENTS
  7. 1. General properties of scientific instruments 1
  8. 2. Special characteristics of meteorological instruments 5
  9. 3. Characteristics of recording instruments in general 6
  10. 4. Control of recording instruments by eye readings of non-recording instruments 11
  11. II. THE MEASUREMENT OF ATMOSPHERIC PRESSURE
  12. 1. General principles and methods 14
  13. 2. Discussion of units of pressure 15
  14. 3. General errors of pressure measurements 17
  15. 4. The mercury barometer 18
  16. 5. Elastic barometers 42
  17. 6. The hypsometer 52
  18. 7. Pressure variographs and variometers 53
  19. III. THE MEASUREMENT OF TEMPERATURE IN METEOROLOGY
  20. 1. Scope of the chapter. Definition of temperature. Units 57
  21. 2. Exposure of thermometers 58
  22. 3. The lag coefficients of meteorological thermometers 63
  23. 4. Classification of meteorological thermometers 67
  24. 5. Liquid-in-glass thermometers 67
  25. 6. Deformation thermometers 75
  26. 7. Liquid-in-metal thermometers 80
  27. 8. Electrical thermometers 82
  28. 9. The testing of thermometers and thermographs 92
  29. 10. Checking thermographs against thermometers in the screen 94
  30. IV. THE MEASUREMENT OF ATMOSPHERIC HUMIDITY
  31. 1. Introduction: Units of measurement 96
  32. 2. Classification of methods of humidity measurement 98
  33. 3. The psychrometer 99
  34. 4. The hair hygrometer 105
  35. 5. The dew-point hygrometer 111
  36. 6. Absorption hygrometry 114
  37. 7. Diffusion hygrometers 115
  38. 8. Optical Hygrometers 115
  39. 9. Hygrometer calibration cechniques 116
  40. V. THE MEASUREMENT OF PRECIPITATION AND EVAPORATION
  41. 1. General considerations 118
  42. 2. The ordinary rain gauge 119
  43. 3. Recording rain gauges 121
  44. 4. Totalizers 125
  45. 5. Rate-of-rainfall recorders 125
  46. 6. Measurement of snow 126
  47. 7. Exposure of rain and snow gauges 126
  48. 8. Rainfall measurements by radar 129
  49. 9. Measurement of dew: Drosometers 130
  50. 10. Measurement of evaporation 131
  51. VI. THE MEASUREMENT OF WIND NEAR THE SURFACE
  52. I. General considerations: Units 135
  53. 2. Wind vanes 136
  54. 3. The measurement of wind speed: Classification of Anemometers 141
  55. 4. Rotation anemometers 141
  56. 5. Pressure-plate anemometers 151
  57. 6. Bridled anemometers 153
  58. 7. Pressure-tube anemometers 153
  59. 8. Anemometers making use of the cooling powers of the air 162
  60. 9. Exposure of wind instruments 164
  61. VII. THE MEASUREMENT OF UPPER WINDS BY MEANS OF PILOT BALLOONS
  62. 1. General remarks 166
  63. 2. Balloons 166
  64. 3. Theodolites for following balloons 175
  65. 4. Methods of observation and computation 181
  66. 5. General accuracy of pilot-balloon results 189
  67. 6. Upper winds by radio and radar 189
  68. 7. Controlled-altitude free balloons 196
  69. VIII. INSTRUMENTS FOR INVESTIGATING CLOUDS
  70. 1. The measurable attributes of clouds 197
  71. 2. Cloud amount 197
  72. 3. Cloud direction 197
  73. 4. Speed of motion 199
  74. 5. Measurement of cloud height 200
  75. 6. The structure of clouds 209
  76. 7. Cloud photography 213
  77. 8. Sferics 214
  78. 9. Radar meteorology 215
  79. IX. SUNSHINE RECORDERS
  80. 1. General considerations 217
  81. 2. The Campbell-Stokes recorder 219
  82. 3. The Jordan sunshine recorder 221
  83. 4. The Pers sunshine recorder 222
  84. 5. The Marvin sunshine recorder 222
  85. 6. Sunshine intensity recorders 224
  86. X. INSTRUMENTS FOR THE INVESTIGATION OF THE UPPER AIR
  87. I. Introduction 228
  88. 2. Sounding balloons 229
  89. 3. Sounding-balloon meteorographs (without radio) 230
  90. 4. Special applications of sounding balloons 231
  91. 5. Aircraft observations 232
  92. 6. Radiosondes: General remarks and classification 243
  93. 7. The time-interval radiosonde 245
  94. 8. Code-type radiosonde 250
  95. 9. The variable-radio-frequency-type radiosonde 252
  96. 10. Variable-audio-frequency radiosonde 254
  97. 11. The errors of radiosondes 260
  98. 12. Constant-level-balloon radiosondes 263
  99. 13. Special uses of radiosondes 263
  100. 14. Calibration apparatus 264
  101. 15. Radio wave soundings 264
  102. XI. SPECIAL METEOROLOGICAL ASSEMBLIES AND SYSTEMS
  103. 1. General 266
  104. 2. Portable packaged weather stations 266
  105. 3. Mobile meteorological stations 266
  106. 4. Automatic weather stations 268
  107. 5. The complete weather instrument-an atmospheric intelligence system 273
  108. INDEX 277
Meteorological Instruments
This chapter is in the book Meteorological Instruments
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