Whirling psychrometer for measuring humidity
1950-1953
Wet and dry bulb psychrometer for humidity measurement
1960-1970
Klinkerfues hygrometer
1870
Aspirated hygrometer by Cooke
1960
Hygrometer element for variable-frequency radiosonde
1944
Electric hygrometer element in sealed glass tube
1944
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Frost point hygrometer
1951
Daniell hygrometer
1822
Edney swing hygrometer by Pastorelli and Rapkin
De Saussure hair hygrometer by Gourdan
Lloyd's hygrodeik by Taylor Bros.
Daniell hygrometer by Newman, 1819.
1819
Franklin hygrometer, 18th century.
1701-1800
Aqueousmeter,Nicolle,1880.
1880
Oat-beard type Hygrometer, 1771-1830
1771-1830
Whirling hygrometer by Zeal
1985
Portable hygrometer by Thomas Jones
1826
Hygrometer (wet & dry bulb) in wooden case
1981-1989
Alluard's dew point hygrometer
1877
Goldbeaters - skin hygrometer
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Dines improved hygrometer
1879
Edney paper hygrometer by Pastorelli and Rapkin
1964
Dobson frost-point hygrometer, 1943
1943
Hygrometer with wet and dry bulb thermometers
1960-1975
One model R.H.W (weekly rev.) Humatograph Recording Hygrometer
Regnault's hygrometer
1943-1980
Air hygrometer, Gas Referees' pattern.
Dine's dew point hygrometer by L. Casella
1851-1950
Mine type Hygrometer
Recording hair hygrometer
Hygrometer, Göttingen, Germany,
Lambrecht Hygrometer
1875-1900
Mason's wet and dry bulb hygrometer
1850
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Small hygrometer surrounded by circular temperature scale in degrees Fahrenheit and Reamur
1801-1900
Daniell's Hygrometer
1870-1910
Mason's wet-and-dry bulb hygrometer
1945-1954
GLCC Hygrometer
1920-1990
Daniell dew point hygrometer
1800-1899
Hygrometer by Casella, c.1950, in case
Hair hygrometer by Klinkerfues
1882
Frost-point hygrometer, MO MkII, 1946
Absorbtion hygrometer, wooden strips, circa 1700
1700
Daniell hygrometer, unsigned, 24 cm high
Diagonal Mercury Barometer with Hygrometer, 1763-1765
1763-1765
Saussure hygrometer
1780
Kater hygrometer, in hinged lidded case
Portable Regnault type hygrometer by Negretti & Zambra, 1931-1940
1931-1940