<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Hi folks Been reviewing Delwins handout entitled "Piano Scalemaking" and noticed in the formula he gives for J  (string stiffness) what appears to be an error and I'd apreciate a correction/clarification. The formula reads   J = (pi^2Yd^2kL^2K)/32  and both Y and K are defined as being 1.9 * 10^11 N/m^2. Doesnt sound likely that Both Y and K would be of an identical such value without some further simplification... ends up being Y ^2 or K^2. Can somebody clear this up for me ?  I'd also like to know what the small k value is.  It is defined as an unspecified numerical constant in the handout. Cheers RicB </body> </html>