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Dewpoint Hygrometer (L. Golaz)

University College

Rectangular black box mounted vertically on a black metal column; copper tubes on either side with nozzles and stopcocks that feed into the flat top; a third copper tube leads up to a small cup; glass windows opposite each other on body; brass post mounted behind apparatus with ring clamp reaching above top of body; circular brass base.

Accession Number: 2009.uc.19

Alternative Name:

Primary Materials: metal, copper, glass, brass


Old Inventory Number = “uc19”. Base labeled “no. 65 L. Golaz Constr. 24 rue des Fosses St. Jacques, Paris 1880”.

Dimensions (cm): Height = 24.5 , Base diameter = 10


Used for the precise determination of relative humidity.


Associated Instruments:

Manufacturer: L. Golaz, Paris

Date of Manufacture: c.1880


Department of Physics, University of Toronto

Additional Information and References:

Historical Notes:

Invented by Alluard in 1877. A similar instrument is found in the Humboldt State University Collection (see Links). Also see W.E. Knowles Middleton (1969). Invention of the Meteorological Instruments.