<HTML><HEAD> <META charset=US-ASCII http-equiv=Content-Type content="text/html; cha= rset=US-ASCII"> <META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD> <BODY style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; BACKGROUND-COLOR: #fffff= f"> <DIV>Well, make that twice I replied to Isaac instead of the list:</DIV> <DIV> </DIV> <DIV> <DIV> <DIV>In a message dated 8/19/2004 11:36:54 PM Pacific Standard Time, oleg-i@= noos.fr writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue = 2px solid"><SPAN class=215312606-20082004><FONT face=Arial color=#0000= ff size=2>I recall an ingenious device from Sanderson, that anybody can ma= ke its own, these are 2 rules (of different height) made of strips of thick = paper where the spacing at the end of the key is marked with the partial ser= ies enlighten. The 2 strips can be used one at the lower note of the interva= l to be tested and the other on the highest, and the scale show immediately = where the partials are coincident. </FONT></SPAN></BLOCKQUOTE></DIV> <DIV>Just last week I made such a device (in minutes, out of poster board) f= or my PTG chapter tuning demonstration. I think everyone should have one unt= il they are facile with the partial series and coincident partials. I gave c= redit to Jim Coleman, Sr., because that's who my fuzzy memory contained as t= he first person I saw use it. Was Al Sanderson actually the first? It's= so clever I would like to credit the right person.</DIV> <DIV> </DIV> <DIV>Bob Davis</DIV></DIV></BODY></HTML>