The sling psychrometer as used by the U.S.
"The Dollar Hen" by Milo M. Hastings
The humidity of the air was observed both by August's psychrometer and Saussure's hygrometer.
"The Voyage of the Vega round Asia and Europe, Volume I and Volume II" by A.E. Nordenskieold
C. between the thermometers of the psychrometer of August's construction.
"The Eruption of Vesuvius in 1872" by Luigi Palmieri
To overcome this difficulty another form of psychrometer has been devised.
"Practical Exercises in Elementary Meteorology" by Robert DeCourcy Ward