Whirling Psychrometer, 1950-1953
1950-1953
Wet and dry bulb psychrometer for humidity measurement
1960-1970
Franklin hygrometer, 18th century.
1701-1800
De Luc whalebone hygrometer by Hausmann, 1781.
1781
Aqueousmeter,Nicolle,1880.
1880
Recording hair hygrometer
Edney paper hygrometer by Pastorelli and Rapkin
1964
One model R.H.W (weekly rev.) Humatograph Recording Hygrometer
De Saussure hair hygrometer by Gourdan
Lloyd's hygrodeik by Taylor Bros.
Whirling hygrometer by Zeal
1985
Edney swing hygrometer by Pastorelli and Rapkin
Dobson frost-point hygrometer, 1943
1943
Goldbeaters - skin hygrometer
Daniell hygrometer
1822
Mine type Hygrometer
Hygrometer, Göttingen, Germany,
Air hygrometer, Gas Referees' pattern.
Hygrometer element for variable-frequency radiosonde
1944
Hygrometer (wet & dry bulb) in wooden case
1981-1989
Portable hygrometer by Thomas Jones
1826
Lambrecht Hygrometer
1875-1900
Aspirated hygrometer by Cooke
1960
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Daniell hygrometer by Newman, 1819.
1819
Hygrometer with wet and dry bulb thermometers
1960-1975
Klinkerfues hygrometer
1870
Regnault's hygrometer
1943-1980
Dine's dew point hygrometer by L. Casella
1851-1950
Dines improved hygrometer
1879
Electric hygrometer element in sealed glass tube
1944
Frost point hygrometer
1951
Alluard's dew point hygrometer
1877
Mason's wet and dry bulb hygrometer
1850
Oat-beard type Hygrometer, 1771-1830
1771-1830
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
Absorbtion hygrometer, wooden strips, circa 1700
1700
Daniell dew point hygrometer
1800-1899
De Saussure hygrometer by Haus, 1824
1824
Daniell hygrometer, unsigned, 24 cm high
Hair hygrometer by Klinkerfues
1882
Frost-point hygrometer, MO MkII, 1946
GLCC Hygrometer
1920-1990
Kater hygrometer, in hinged lidded case
Hair hygrometer by R.B. Bate, London, circa 1830.
1830-1840
Hygrometer by Casella, c.1950, in case
Met Office hygrometer
Mason's wet-and-dry bulb hygrometer
1945-1954
Dew-point hygrometer by Secretan
1845-1900
