On that form of chemical hygrometer in which sulphuric acid has been used as the absorbent : the Johnson memorial prize essay for 1891 / by M.S. Pembrey.

  • Pembrey, M. S. (Marcus Seymour), 1868-1934.
Date:
[1891]
Catalogue details

Licence: Public Domain Mark

Credit: On that form of chemical hygrometer in which sulphuric acid has been used as the absorbent : the Johnson memorial prize essay for 1891 / by M.S. Pembrey. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    18/38 (page 16)
    there are several serious objections. Snellen, after obser- vations made with this hygrometer for several months, found that even when no air is being aspirated through the apparatus it is far from remaining in one position. This irregularity he believed to be due to extensive and irregular variations in the density of the oil—variations which could not be eliminated by any correction for tem- perature. This objection was admitted by Baumhauer