<html> <head> </head> <body> Was posted........ """The bridge is not a ridged termination. (coupled motion of piano strings). If the rigidity changes with humidity then the string may appear longer or shorter thus affecting pitch. Dean Reyburn refers to this effect as “para inharmonicity”i.e."""" I would like to offer some arguments to disprove the idea of coupled motion, and  para inharmonicity, and to look at inharmonicity in a new light.   "Coupled motion" is  dispelled when the definition of it is given.  It is not logical, rational, nor holds up to the Scientific Method of proof by experiment. "Para inharmonicity" is a myth to explain (or excuse) the short commings of tuning machines.  Inharmonicity seems to be a valid scientific phenonenom but still eludes consistant measurement. --Richard Moody   </body> </html>