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<DIV><FONT face=Arial size=2>No, although the main rod's weight is a factor, as
are the weights of the eccentric cranks, back ends of the eccentric rods,
etc.. It is because the A's main drivers were cross-counterbalanced; when
drivers are cross-counterbalanced, they're counterbalanced as the pair on the
axle, rather than as individual wheels. This was often seen on the main
drivers of locomotives but seldom on other drivers, which were usually
counterbalanced as individual wheels.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>EdKing</FONT> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=nw-mailing-list@nwhs.org href="mailto:nw-mailing-list@nwhs.org">NW
Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nw-mailing-list@nwhs.org
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<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, March 25, 2009 3:53
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Wheel spokes</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Very interesting. I had always assumed that
counterweights were centered exactly opposite the pin holding the rods.
While that appears true for the front and middle A drivers, it is obvious from
the drawing that it is not true for the main driver. Would this be
because the added weight of the main rod throws the balance
off-center?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Sam Putney</FONT></DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=nw-mailing-list@nwhs.org href="mailto:nw-mailing-list@nwhs.org">NW
Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=nw-mailing-list@nwhs.org
href="mailto:nw-mailing-list@nwhs.org">NW Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, March 23, 2009 8:20
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Wheel spokes</DIV>
<DIV><BR></DIV>Richard,<BR><BR>I'm surprised no one else has answered this
yet. The number is 15. <BR><BR>You can see drawings of the drivers at the
following addresses:<BR><BR>Front Driving Wheel <A
href="http://www.nwhs.org/archivesdb/detail.php?ID=23293"
eudora="autourl">http://www.nwhs.org/archivesdb/detail.php?ID=23293<BR></A>Intermediate
Driving Wheel <A href="http://www.nwhs.org/archivesdb/detail.php?ID=23187"
eudora="autourl">http://www.nwhs.org/archivesdb/detail.php?ID=23187</A><BR>Main
Driving Wheel <A href="http://www.nwhs.org/archivesdb/detail.php?ID=23192"
eudora="autourl">http://www.nwhs.org/archivesdb/detail.php?ID=23192</A><BR><BR>Listing
of more Class A wheel drawings is at <A
href="http://www.nwhs.org/archivesdb/listdocs.php?index=rs&id=161&Searchword=wheel"
eudora="autourl">http://www.nwhs.org/archivesdb/listdocs.php?index=rs&id=161&Searchword=wheel</A>
<BR><BR>Ron Davis<BR><BR>At 03:15 PM 3/20/2009, you wrote:<BR>
<BLOCKQUOTE class=cite cite="" type="cite"><FONT size=2>Hi chaps<BR>Can
somebody tell me the exact number of spokes on a Class A driving wheel,
thanks in advance<BR></FONT> <BR><FONT size=2>Regards Richard in
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