The hygrometer described is continuous-indicating; a value of the humidity is obtained by balancing a column of atmospheric air against a column of air saturated with water vapor and observing the effect, on a suspended vane, of the difference of pressure due to the different densities. The instrument used in the investigation is more sensitive than the Regnault-Alluard type of dew-point hygrometer and can be made a hundred times as sensitive if required.

© 1926 Optical Society of America

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Figures (5)

F. 1
F. 1

The hygrometer.

F. 2
F. 2

Box D with vane.

F. 3
F. 3

The suspended system.

F. 4
F. 4

Deflection due to flow through instrument.

Tables (1)

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Table 1 Relative humidity for deflections and temperatures ranging from zero to 13.3 cm and from −15°C to 35°C, respectively. Scale distance 58.5 cm.

Equations (2)

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Rel . Hum . = T P V vapor pressure of water vapor in tube C C T P V
Rel . Hum . = T P V 3.16 deflection T P V .