Sling psychrometer. A) is a silver board in which the thermometers are inserted into before the psychrometer is used. B) and C) are the thermometers, which are each being stored in clear blue tubes. The thermometers are WEKSLER, makers mark is visible if you remove them from the tubes. The silver mount is "FRIEZ", makers mark visible.
Date of Object:
New building board room shelf
a) 43 cm L x 3 cm W x 0.5 cm H b) 17.5 cm L X 3.5 cm Circ c) 17.5 cm L x 3.5 cm Circ