Russelveldt hair hygrometer, c. 1922.

Made:
1922 in Norway

Russelveldt hair hygrometer, c. 1922.

Details

Category:
Meteorology
Object Number:
1922-9
Materials:
brass and thread
Measurements:
overall: 23.3 x 12.5 cm
type:
hygrometer
credit:
Meteorological Office