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
Daniell hygrometer
1822
Daniel's dew point hygrometer
1891
Whirling hygrometer by Zeal
1985
Daniell hygrometer by Newman, 1819.
1819
Daniell's Hygrometer
1870-1910
A Coventry Absorption Hygrometer and Spare Paper Discs.
1790
Edney swing hygrometer by Pastorelli and Rapkin
Alluard's dew point hygrometer
1877
Mason's wet and dry bulb hygrometer
1850
Diagonal Mercury Barometer with Hygrometer, 1763-1765
1763-1765
Klinkerfues hygrometer
1870
Regnault's hygrometer
1943-1980
Lloyd's hygrodeik by Taylor Bros.
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Daniell hygrometer, unsigned, 24 cm high
Kater hygrometer, in hinged lidded case
Absorbtion hygrometer, wooden strips, circa 1700
1700
Aspirated hygrometer by Cooke
1960
Hair hygrometer by Klinkerfues
1882
Franklin hygrometer, 18th century.
1701-1800
Mason's wet-and-dry bulb hygrometer
1945-1954
GLCC Hygrometer
1920-1990
De Saussure hair hygrometer by Gourdan
Hygrometer element for variable-frequency radiosonde
1944
Dobson frost-point hygrometer, 1943
1943
Recording hair hygrometer
Saussure hygrometer
1780
Dines improved hygrometer
1879
Daniell hygrometer
1860-1880, 1812 (design)
Dew-point hygrometer by Secretan
1845-1900
Prototype Meteorological Office frost point hygrometer
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Hygrometer with wet and dry bulb thermometers
1960-1975
Mine type Hygrometer
De Saussure hygrometer by Haus, 1824
1824
Whalebone hygrometer by Devrine, Paris.
Alluard's dew point hygrometer
1877
Dines hygrometer, vertical form, 1879
1879
Daniell dew point hygrometer
1800-1899
Small hygrometer surrounded by circular temperature scale in degrees Fahrenheit and Reamur
1801-1900
Met Office hygrometer
Dine's dew point hygrometer by L. Casella
1851-1950
Air hygrometer, Gas Referees' pattern.
Frost point hygrometer
1951