Thanks for those links. You can use the long hairs from a horse's tail too if you don't want to spend US$600 -:) -- see:
http://www.usatoday.com/weather/whairhyg.htm http://www.ehow.com/way_5820088_homemade-hair-hygrometer.html I've hear that the US weather service stations use dew point sensors based on chilling a mirror 'til it fogs. Where I live, you'd have to chill it to <40 below zero ( °C == °F there ) to get it to fog, though. Hoyt Stearns Scottsdale, Arizona US -----Original Message----- From: Jeff Driscoll [mailto:hcarb...@gmail.com] Sent: Saturday, June 25, 2011 12:51 PM To: vortex-l@eskimo.com Subject: Re: [Vo]:E-Cat vs. Water Heater for coffee/tea... The discussion related to Galantini using the wrong instrument to measure steam quality in Rossi's experiment seems to be slowing down. But here are details on how a relative humidity sensor works (as others have also mentioned)....
