Roger Wheelock at Dampp-Chaser has done much of that research. If you contact him at DC he'd probably be happy to share the results. He frequently attends the Cybercafe sessions on the last day of the PTG Annual Institute, and he's a fount of information on the subject. Of course, he might be slightly prejudiced in favor of his company, but the skeptics are free to perform the same tests to corroborate (or test) his findings. Patrick I'm > really asking a question here: Have you (or has anyone else) done > measurements with a good, accurate hygrometer on a complete DC grand > installation, during dry ambient conditions, showing that humidity is indeed > evenly distributed all over the soundboard, both under and on top, and in > the action cavity? Also, have the same measurements been done inside the > piano with a closed lid and inside the action cavity during predominantly > dehumidifying periods? In other words, are DC's claims fully substantiated, > as determined empirically with a hygrometer?
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