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Detailed explanation of how to take readings from and issues around readings from a psychrometer, references to contemporary research in hygrometry and the work of [Andrew John] Herbertson and his work at Ben Nevis, commentary on work of [ ] Groyet, [ ] Regnault, and [James] Glaisher with various types of psychrometer for the measurement of relative humidity. Describes Hazen's own experiments and outlines formulas relating to vapour and air pressure.