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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 13, Iss. 6 — Dec. 1, 1926
  • pp: 717–721



JOSA, Vol. 13, Issue 6, pp. 717-721 (1926)

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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.

ARNOLD ROMBERG and L. W. BLAU, "A NEW HYGROMETER," J. Opt. Soc. Am. 13, 717-721 (1926)

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  1. Cooling the dew-point hygrometer with ether was found to be impractical on account of the fact that it was difficult to prevent the escape of small quantities of ether from the dew-point instrument. Since ether vapor is soluble in water it was taken up by the water after its passage through the tube CC′, and since its density is greater than that of air, the presence of ether vapor increased the deflection of the new hygrometer, for under the circumstances the tube CC′ contained a mixture of greater density than when the ether vapor was absent.
  2. The tubes of the instrument used in the investigation have an inside diameter of 0.8 cm. It was found that air currents caused erratic deflections, and the viscosity was subsequently increased by inserting tubes having an inside diameter of 0.4 cm into the tubes of the instrument. After this was done the deflections became very steady indeed.

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