Instructions for observing air temperature, humidity, and direction and force of wind
Division of Hydrography Circular
2
By: Water Resources Division, U.S. Geological Survey
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Abstract
Description of instruments.-The temperature and humidity of the air are obtained from the simultaneous observation of a pair of mercurial thermometers termed the dry and the wet bulb. The air temperature is given by the dry-bulb thermometer, and the humidity is obtained from the combined readings of both. The wet-bulb thermometer differs from the dry-bulb thermometer only in having its bulb covered with thin muslin, which is wetted in pure water at each observation.The two thermometers are fastened in a light metal 'or wooden frame. To this frame is to be attached a stout cord for the whirling of the thermometers, which is an essential part of every observation.
Suggested Citation
Water Resources Division, U.S. Geological Survey, 1892, Instructions for observing air temperature, humidity, and direction and force of wind: U.S. Geological Survey Division of Hydrography Circular 2, 7 p., https://doi.org/10.3133/70046395.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Instructions for observing air temperature, humidity, and direction and force of wind |
| Series title | Division of Hydrography Circular |
| Series number | 2 |
| DOI | 10.3133/70046395 |
| Year Published | 1892 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Washington, D.C. |
| Description | 7 p. |
| Additional Online Files (Y/N) | N |