Abstract
A METHOD was required whereby the relative humidity (R.H.) of air in equilibrium with cotton samples could be determined to one half of one per cent. The apparatus had to maintain its zero and its calibration year in and year out, so as to make it suitable for routine employment in a testing laboratory. Certified thermometers which are used within the limits of ordinary room temperature changes can fulfil this condition, so the wet-and-dry-bulb method was investigated and improved until it became precise. So far as cotton-testing is concerned, the work is at present in suspense, but the wet-bulb hygrometer was tried out during a couple of years and seems to merit description.
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BALLS, W. Precision Hygrometry with a Wet-Bulb. Nature 152, 389–390 (1943). https://doi.org/10.1038/152389a0
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DOI: https://doi.org/10.1038/152389a0
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