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
Mine type Hygrometer
Recording hair hygrometer
Hygrometer, Göttingen, Germany,
Air hygrometer, Gas Referees' pattern.
Aspirated hygrometer by Cooke
1960
Frost point hygrometer
1951
Daniell hygrometer by Newman, 1819.
1819
Oat-beard type Hygrometer, 1771-1830
1771-1830
Portable hygrometer by Thomas Jones
1826
Hygrometer (wet & dry bulb) in wooden case
1981-1989
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Hygrometer with wet and dry bulb thermometers
1960-1975
Mason's wet and dry bulb hygrometer
1850
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Regnault's hygrometer
1943-1980
Dine's dew point hygrometer by L. Casella
1851-1950
Franklin hygrometer, 18th century.
1701-1800
Aqueousmeter,Nicolle,1880.
1880
Whirling hygrometer by Zeal
1985
Alluard's dew point hygrometer
1877
Goldbeaters - skin hygrometer
Dines improved hygrometer
1879
Edney paper hygrometer by Pastorelli and Rapkin
1964
Dobson frost-point hygrometer, 1943
1943
One model R.H.W (weekly rev.) Humatograph Recording Hygrometer
Lambrecht Hygrometer
1875-1900
Klinkerfues hygrometer
1870
Hygrometer element for variable-frequency radiosonde
1944
Electric hygrometer element in sealed glass tube
1944
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Daniell hygrometer
1822
Edney swing hygrometer by Pastorelli and Rapkin
De Saussure hair hygrometer by Gourdan
Lloyd's hygrodeik by Taylor Bros.
Daniell dew point hygrometer
1800-1899
Hygrometer by Casella, c.1950, in case
Mason's wet-and-dry bulb hygrometer
1945-1954
GLCC Hygrometer
1920-1990
Small hygrometer surrounded by circular temperature scale in degrees Fahrenheit and Reamur
1801-1900
Diagonal Mercury Barometer with Hygrometer, 1763-1765
1763-1765
Portable Regnault type hygrometer by Negretti & Zambra, 1931-1940
1931-1940
Dines dew point hygrometer
Daniel's dew point hygrometer
1891
Kater hygrometer,1809, by Thomas Charles Robinson.
1826-1834
Dines hygrometer, vertical form, 1879
1879
Frost point hygrometer
1951
Wet and dry bulb hygrometer by Tozer
1870-1880