<!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 5.50.4616.200" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=pianobuilders@olynet.com href="mailto:pianobuilders@olynet.com">Delwin D Fandrich</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Is that really what it = says? The bubble gages I used at the factory were supposed to be calibrated to indicate = a deflection of 17 minutes of arc which was supposed to translate to = 0.5% string downforce. I.e., with a string having, say, 175 lbs of tension a = bubble gage deflection of one gradation indicated a string downforce of 8.75 lbs. = I have to admit I took the above at face value and didn't do any checking to = verify, but that, at least, was the theory.</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Del</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Thank you for that post, = Del.  Finally the plot thins.</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>The sheets I borrowed = include figures 1 thru 6.  Although no mention in the text refers to angle but = mentions divisions, the pictures of a bridge and the gauge clearly show and say = that 1 division equals 1/2 degrees bearing.  I don't know how to type = the symbol for degrees so I've spelled it out. </FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>There is also an 8 = page  discussion of downbearing by Alan Vincent and it does show the relationship as = you noted.  Yes, one division is 17' of arc and he lists one division = as .5% on the last page.</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>The first page of the = instructions entitled "Procedure to establish proper down bearing of strings on = bridges of Baldwin Grand Pianos designed with hollow vertical (Acu-just) hitch pins." gives the procedure and contains the conclusion that I = mentioned about not being able to recheck and that statement I attributed to advertising.  Attached to this sheet were the drawings of the = gauge and bridges with the labels that are obviously in error.</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Thanks for clearing this = all up.</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Regards</FONT></DIV> <DIV dir=ltr><FONT face=Arial size=2></FONT> </DIV> <DIV dir=ltr><FONT face=Arial size=2>Carl Meyer  Assoc. = PTG<BR>Santa Clara, California<BR><A = href="mailto:cmpiano@attbi.com">cmpiano@attbi.com</A> </FONT></DIV></BLOCKQUOTE></BODY></HTML>