Robuta

https://data.epo.org/publication-server/rest/v1.2/publication-dates/19940831/patents/EP0447052NWB1/document.html Method and apparatus for the measurement of wet and dry bulb temperatures and water content of gas... Method and apparatus for the measurement of wet and dry bulb temperatures and water content of gas streams - Patent 0447052 dry bulb temperaturesfor thewater contentmethodapparatus