Whirling psychrometer for measuring humidity
1950-1953
Wet and dry bulb psychrometer for humidity measurement
1960-1970
Klinkerfues hygrometer
1870
Daniell hygrometer
1822
Edney swing hygrometer by Pastorelli and Rapkin
Lloyd's hygrodeik by Taylor Bros.
Franklin hygrometer, 18th century.
1701-1800
Aqueousmeter,Nicolle,1880.
1880
Whirling hygrometer by Zeal
1985
Hygrometer (wet & dry bulb) in wooden case
1981-1989
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Recording hair hygrometer
Goldbeaters - skin hygrometer
Edney paper hygrometer by Pastorelli and Rapkin
1964
Dobson frost-point hygrometer, 1943
1943
Hygrometer, Göttingen, Germany,
One model R.H.W (weekly rev.) Humatograph Recording Hygrometer
Air hygrometer, Gas Referees' pattern.
Alluard's dew point hygrometer
1877
Electric hygrometer element in sealed glass tube
1944
Dines improved hygrometer
1879
Mine type Hygrometer
De Saussure hair hygrometer by Gourdan
Regnault's hygrometer
1943-1980
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Portable hygrometer by Thomas Jones
1826
Aspirated hygrometer by Cooke
1960
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Dine's dew point hygrometer by L. Casella
1851-1950
Frost point hygrometer
1951
Mason's wet and dry bulb hygrometer
1850
Hygrometer with wet and dry bulb thermometers
1960-1975
Daniell hygrometer by Newman, 1819.
1819
Hygrometer element for variable-frequency radiosonde
1944
Oat-beard type Hygrometer, 1771-1830
1771-1830
Lambrecht Hygrometer
1875-1900
Daniell hygrometer
1860-1880, 1812 (design)
GLCC Hygrometer
1920-1990
Daniell dew point hygrometer
1800-1899
Alluard's dew point hygrometer
1877
Prototype Meteorological Office frost point hygrometer
Wet and dry bulb hygrometer by Tozer
1870-1880
Hygrometer by Casella, c.1950, in case
Met Office hygrometer
Hair hygrometer by R.B. Bate, London, circa 1830.
1830-1840
Hair hygrometer by Klinkerfues
1882
Daniell hygrometer, unsigned, 24 cm high
De Saussure hygrometer by Haus, 1824
1824
Whalebone hygrometer by Devrine, Paris.
Dew-point hygrometer by Secretan
1845-1900