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