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Details and Image

TypeModel No.MakerCountryConstruction
DateScale LengthArea of Use
ML-429/UM Psychrometric Calculator
Sillcocks-Miller Co. for the Signal Corps U.S. ArmyUSA
est. 1960'sDia. = 28.7 cmWeather

Notes: "1) Used for weather calculations, dew point, temperature 2) Using air temperature and humidity values this slide rule allows the calculation of the other humidity values, including wet bulb temperature, dew point temperature, and relative humidity."

Image 1

Image 2