Wet and dry bulb psychrometer for humidity measurement
1960-1970
Whirling psychrometer for measuring humidity
1950-1953
De Saussure Hair Hygrometer, 1815-1841
1815-1841
Edney paper hygrometer by Pastorelli and Rapkin
1964
Lambrecht Hygrometer
1875-1900
Oat-beard type Hygrometer, 1771-1830
1771-1830
Mason's wet and dry bulb hygrometer
1850
Daniell hygrometer
1822
Whirling hygrometer by Zeal
1985
Daniel's dew point hygrometer
1891
Daniell hygrometer by Newman, 1819.
1819
Edney swing hygrometer by Pastorelli and Rapkin
A Coventry Absorption Hygrometer and Spare Paper Discs.
1790
Daniell's Hygrometer
1870-1910
Klinkerfues hygrometer
1870
Alluard's dew point hygrometer
1877
Diagonal Mercury Barometer with Hygrometer, 1763-1765
1763-1765
Hygrometer (wet & dry bulb) in wooden case
1981-1989
Lloyd's hygrodeik by Taylor Bros.
Regnault's hygrometer
1943-1980
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Kater hygrometer, in hinged lidded case
Absorbtion hygrometer, wooden strips, circa 1700
1700
Daniell hygrometer, unsigned, 24 cm high
Portable Regnault type hygrometer by Negretti & Zambra, 1931-1940
1931-1940
Mason's wet-and-dry bulb hygrometer
1945-1954
Aspirated hygrometer by Cooke
1960
Recording hair hygrometer
Saussure hygrometer
1780
Hair hygrometer by Klinkerfues
1882
GLCC Hygrometer
1920-1990
De Saussure hair hygrometer by Gourdan
Franklin hygrometer, 18th century.
1701-1800
Dobson frost-point hygrometer, 1943
1943
Hygrometer element for variable-frequency radiosonde
1944
Mine type Hygrometer
Dines improved hygrometer
1879
Whalebone hygrometer by Devrine, Paris.
Goldbeaters - skin hygrometer
Prototype Meteorological Office frost point hygrometer
Daniell hygrometer
1860-1880, 1812 (design)
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Met Office hygrometer
Reconstruction absorbtion hygrometer
Dew-point hygrometer by Secretan
1845-1900
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Hygrometer with wet and dry bulb thermometers
1960-1975
Frost point hygrometer
1951
Daniell dew point hygrometer
1800-1899
Electric hygrometer element in sealed glass tube
1944