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| Keywords: Psychrometer.jpg psychrometer of Assmann type before 1900 Ballonaspirationspsychrometer nach Richard Aßmann Richard Aßmann und Arthur Berson Hrsg Wissenschaftliche Luftfahrten Band 1 Vieweg Braunschweig 1899 Author < 1899 Psychrometers Measuring instruments temperature Balloon history PD-old | ||||
