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<font color='black' size='3' face='Georgia, Times New Roman, Times, Serif'>C<font size="3">orrosion of this type is due to electrolytic action where two dissimilar metals are in conttact with each other. The action occurs when the metals get wet a chemical reaction in sues when one of the two metals is eroded away. When this type of action happens a small potential difference is generated. I've seen much more dramatic examples when the bell is near the sea.<br>
<br>
DG<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: Ted Steele teds.bells@tesco.net [bellhistorians] <bellhistorians@yahoogroups.com><br>
To: bellhistorians <bellhistorians@yahoogroups.com><br>
Sent: Sat, 8 Oct 2016 21:06<br>
Subject: [Bell Historians] Advice please [2 Attachments]<br>
<br>
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<span style="font-weight: 700; font-size: 12px; display: block; margin-bottom: 20px;">[<a style="text-decoration: none;" href="#TopText">Attachment(s)</a> from Ted Steele included below]</span>
<div>I attach two pictures (one is a little out of focus; sorry) that show<br>
the tie rods fixing a bell to a wooden head-stock; the canons having<br>
been removed. I am asked to inquire whether anyone has an explanation<br>
for the cause of the necking, that is the thinning of the rods where<br>
they enter the hole through the crown of the bell. While it is simple to<br>
see that there is corrosion there the question is, what causes such<br>
corrosion? One would expect that simple weathering would be more uniform<br>
along the rod but elsewhere it is only light. It is suggested that<br>
moisture condenses on the rod and runs down and is collected around the<br>
hole through the bell and so causes corrosion at that point, but if so<br>
is this simply rusting? The person inquiring asks specifically if there<br>
could be some Galvanic action involved between the dissimilar metals of<br>
the bell and the tie rods.<br>
<br>
Further to this I am personally interested to know something of the<br>
history of the practice of removing canons. When did this begin and what<br>
was its original purpose? Was there ever a trade off for the bell hanger<br>
by taking some metal in part payment? To what extent can the removal of<br>
canons give us a time frame for when bells were rehung without them.<br>
<br>
All info will be gratefully received.<br>
<br>
Thanks Ted<br>
<br>
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