Whirling psychrometer for measuring humidity
1950-1953
Wet and dry bulb psychrometer for humidity measurement
1960-1970
Daniell hygrometer by Newman, 1819.
1819
Klinkerfues hygrometer
1870
Daniell hygrometer
1822
Edney swing hygrometer by Pastorelli and Rapkin
Lloyd's hygrodeik by Taylor Bros.
Hygrometer element for variable-frequency radiosonde
1944
Franklin hygrometer, 18th century.
1701-1800
Aqueousmeter,Nicolle,1880.
1880
Whirling hygrometer by Zeal
1985
Portable hygrometer by Thomas Jones
1826
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
Aspirated hygrometer by Cooke
1960
Oat-beard type Hygrometer, 1771-1830
1771-1830
Hygrometer, Göttingen, Germany,
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
Frost point hygrometer
1951
Alluard's dew point hygrometer
1877
Electric hygrometer element in sealed glass tube
1944
Dines improved hygrometer
1879
Mine type Hygrometer
Lambrecht Hygrometer
1875-1900
De Saussure hair hygrometer by Gourdan
Hygrometer with wet and dry bulb thermometers
1960-1975
Daniell hygrometer by W. & S. Jones, circa 1825
1825
Mason's wet and dry bulb hygrometer
1850
Kater-type Hygrometer by Thomas Jones, London, 1811-1814
1811-1814
A Coventry Absorption Hygrometer and Spare Paper Discs.
1790
Diagonal Mercury Barometer with Hygrometer, 1763-1765
1763-1765
Prototype Meteorological Office frost point hygrometer
Wet and dry bulb hygrometer by Tozer
1870-1880
Hygrometer by Casella, c.1950, in case
Dines dew point hygrometer
Frost point hygrometer
1951
Met Office hygrometer
Hair hygrometer by R.B. Bate, London, circa 1830.
1830-1840
Daniel's dew point hygrometer
1891
Hair hygrometer by Klinkerfues
1882
Daniell hygrometer, unsigned, 24 cm high
De Saussure hygrometer by Haus, 1824
1824
