Clark, If my memory serves correctly, Ken Sloane gave a class several years ago concerning the utilization of the back check in repetition. I believe it was at the CAUT gathering at the previous gathering in KC (not 1999). That would be my first place to turn. Allan Allan L. Gilreath, RPT Assistant Institute Director PTG Annual Convention Arlington, VA July 5-9, 2000 Agilreath@mindspring.com 706 629-3063 -----Original Message----- From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]On Behalf Of Clark Sent: Thursday, September 30, 1999 7:42 AM To: pianotech@ptg.org Subject: Back check study I've heard about a study performed by Yamaha regarding the role of the back check in repetition, I think in uprights. Could someone provide a reference toward this? We have an 1850s Hallet & Davis grand which is similar to the instrument in the Boston Museum of Fine Arts, though possibly earlier. Its action is essentially a single action as featured in later, larger squares - however the back check is fitted on a lever so that when a key is pressed the back check rises faster than the key end. Checking is done on the hammer tail as usual. It was obtained for the right price: five big squares. Unfortunately the piano won't be in playing condition for some time, but it would be interesting to compare the findings of the study with this application of the back check. If anyone is interested, I should have a scale drawing of it in the next couple months. Clark
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