I don't know what all the fuss is about accuracy of humidity gauges. The owners manual with my Bacharach (No, NOT Burt!!) Sling Psychrometer says: "In addition to the above instructions, barometric pressure and other factors will influence exact relative humidity determinations to a very minor degree. For precise work, use psychometric chart or set of table such as W.B. 235 'Psychrometric Tables for Obtaining the Vapor Pressure, Relative Humidity, and Temperature of the Dew Point' which can be purchased from Superintendent of Documents, US Gov. Printing Office. However, accuracy of the Psychrometer is satisfactory for all except the most exacting work." For our type of work, it's only really necessary to have an approximate humidity reading. After all, it will change with the temperature! This reminds me of the first time I owned a decent watch, with a quartz crystal. I had access to the railroad phone number with ACCURATE time. It said: "At the tone 4 hours 22 minutes coordinated universal time". I took it to the jewelers and told them it gained time. They asked how much time, and I told them 1.5 seconds a month!!! I could tell by the expression on the jeweler's face I was in for a long and frustrating career as a "perfectionist"! "If football players were armed with guns, there wouldn't be stadiums large enough to hold the crowds."--Irwin Shaw -------------------------------------------------- jminor@uiuc.edu//John Minor//University of Illinois
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