<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2600.0" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>Dear Physicists of the = List-</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Please comment on this = thought:</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>When I press the piano key, the = resistance to movement I feel consists of three elements</FONT></DIV> <DIV><FONT face=Arial size=2>1) Friction</FONT></DIV> <DIV><FONT face=Arial size=2>2) The pull of gravity on the hammer = and wippen, partly counterbalanced by the pull of gravity on the = keyfront.</FONT></DIV> <DIV><FONT face=Arial size=2>3) The combined MOI's of the various = moving parts.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Therefore, if I can </FONT></DIV> <DIV><FONT face=Arial size=2>1) reduce the friction to zero, and = </FONT></DIV> <DIV><FONT face=Arial size=2>2) use a wippen assist spring to = produce a balance weight of zero, the only resistance left would be </FONT></DIV> <DIV><FONT face=Arial size=2>3) the combined MOI's of the key, = wippen and hammer.  </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>What I would feel then, in various key = strokes, would be whatever it is we are talking about. </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Could I make or buy a gauge to measure this?</FONT> </DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Does this line of thought seem useful = in understanding the situation?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>For example, has anyone felt a key such = as I describe?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Ed Sutton</FONT></DIV></BODY></HTML>