Hi Julia, The first reason to document humidity at the time of tuning is that when you get a "call back" you can remeasure the humidity. If it has changed 5% or more, then the longevity of the tuning is extremely suspect, and you are not the cause of the instability. I have repeatedly documented that a 5% change will cause the pitch at A4 to drift about 4 cents (once the piano stabilizes at the new RH). These changes approximately double for each octave down A4 until you reach the bass break and the first wound string below the strut. The second reason is to help the client understand that humidity control for their piano is a desireable goal. If the humidity is not kept above 30% serious wood failure may happen. Above 60% metal may rust amazingly rapidly. The third reason is that *if* your pleas to the client to control humidity fall on deaf ears you can make an informed "guess" as to how much of the pitch change is due to humidity--which will allow you to offer the client slightly better service by "floating the pitch". The fourth reason is that some day you wish to drop those "floaters" from your database, because it is never very satisfying professionally to deal with pianos that are not cared for properly. I could give you many other reasons, but I think you will have the idea by now. Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. 3004 Grant Rd, Regina, SK, S4S 5G7 Tuner for the Saskatchewan Centre of the Arts http://us.geocities.com/drpt1948/ __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/
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