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Instructions for observing air temperature, humidity, and direction and force of wind

Division of Hydrography Circular 2

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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.

Additional Publication Details

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
Year Published:
1892
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Washington, D.C.
Description:
7 p.
Additional Online Files(Y/N):
N