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Whirling psychrometer

1966

Whirling hygrometer, British, 1986

1986

Whirling psychrometer

1940-1945
Frame for whirling psychrometer, by Casella, London. Used by Home Office Scientific Advisory Branch.

Frame for whirling psychrometer

1920-1940
Frame for whirling psychrometer, by Casella, London

Frame for whirling psychrometer

1920-1940