<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">thank you for the advice.</SPAN></div>
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<DIV style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px" class=hr contentEditable=false readonly="true"></DIV><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Crispin Pemberton-Pigott <crispinpigott@gmail.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> 'Discussion of biomass cooking stoves' <stoves@lists.bioenergylists.org> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Sunday, January 6, 2013 3:58 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Stoves] Thermometers for WBT<BR></FONT></DIV><BR>
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<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d">Dear Tom</SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d">Please get something with a decent thermal mass. The tiny wires spot-welded together at the end are not very helpful at getting the temperature because they fluctuate so rapidly when the bubbles start rising. It should have an enclosing metal jacket of 3-8mm diameter. They still react quickly but not ‘instantly’.</SPAN></div>
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<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d">I have also found that mounting it in the centre of a pot also heated in the centre (from below) gives misleading numbers. Prof Lloyd says there is actually no such thing as the boiling point of a whole pot of water. My conclusion is that the best we can get is the time at which the average temperature reaches its maximum. Using only one thermocouple in a round pot, it should be placed somewhere like 1/3 of the diameter towards the centre. </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d">Regards</SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d">Crispin</SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN style="COLOR: #1f497d"> </SPAN></div>
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<div class=yiv1277125752MsoNormal><B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt" lang=EN-US>From:</SPAN></B><SPAN style="FONT-FAMILY: 'Tahoma', 'sans-serif'; FONT-SIZE: 10pt" lang=EN-US> Stoves [mailto:stoves-bounces@lists.bioenergylists.org] <B>On Behalf Of </B>Tom Miles<BR><B>Sent:</B> Sunday, January 06, 2013 2:49 PM<BR><B>To:</B> stoves@lists.bioenergylists.org<BR><B>Subject:</B> [Stoves] Thermometers for WBT</SPAN></div></DIV></DIV>
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<div class=yiv1277125752MsoNormal><SPAN lang=EN-US>What are the lowest cost and most practical thermometers for the WBT? </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN lang=EN-US> </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN lang=EN-US>Many thanks</SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN lang=EN-US> </SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN lang=EN-US>Tom</SPAN></div>
<div class=yiv1277125752MsoNormal><SPAN lang=EN-US> </SPAN></div></DIV></DIV></DIV><BR>_______________________________________________<BR>Stoves mailing list<BR><BR>to Send a Message to the list, use the email address<BR><A href="mailto:stoves@lists.bioenergylists.org" ymailto="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A><BR><BR>to UNSUBSCRIBE or Change your List Settings use the web page<BR><A href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org" target=_blank>http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</A><BR><BR>for more Biomass Cooking Stoves, News and Information see our web site:<BR><A href="http://www.bioenergylists.org/" target=_blank>http://www.bioenergylists.org/</A><BR><BR><BR><BR></DIV></DIV></div></body></html>