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<DIV><FONT face=Arial>Dear Crispin</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>I don't understand the graph...</FONT></DIV>
<DIV><FONT face=Arial>1: What are the units of the vertical scale? (Is it Grams
weight?)</FONT></DIV>
<DIV><FONT face=Arial>2: The weight (?) gain is virtually
instantaneous.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Presuming the vertical axis is the weight of the stove
system and contents in grams, the instantaneous system weight gain would be
108,400 less 103,800 = 4,600 grams.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>What could possibly explain such a large and instantaneous
weight gain? Did someone simply put more wood or coal on the fire?</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Best wishes,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Kevin</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=crispinpigott@gmail.com href="mailto:crispinpigott@gmail.com">Crispin
Pemberton-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">'Discussion of biomass cooking
stoves'</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, February 25, 2013 2:45
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] combustion of char
-- spontaneous and dangerous</DIV>
<DIV><BR></DIV>
<DIV class=WordSection1><PRE><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt" lang=EN-US>Dear Friends<o:p></o:p></SPAN></PRE><PRE><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt" lang=EN-US><o:p> </o:p></SPAN></PRE><PRE><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt" lang=EN-US>Here is a mass profile, raw and smoothed with 21 point simple averaging (minus 1000 to pull it down so you can see it).<o:p></o:p></SPAN></PRE><PRE><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt" lang=EN-US><o:p> </o:p></SPAN></PRE><PRE><IMG id=Chart_x0020_1 src="cid:719D7F8F98E349CC965BF17CE8B8A94A@usera594fda0bf" width=799 height=476><SPAN style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt" lang=EN-US><o:p></o:p></SPAN></PRE>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"
lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"
lang=EN-US>There is a clear sustained increase in the mass after about 800
minutes (readings are per 10 seconds). The jumping around in the middle of the
night is, I believe, wind on the chimney. I am quite prepared to believe that
the effect of wind might explain 100% of the change in the line, but it is
worth looking at the whole fuel composition issue just in case there is
something new to learn.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"
lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"
lang=EN-US>Regards<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"
lang=EN-US>Crispin<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"
lang=EN-US><o:p> </o:p></SPAN></P></DIV>
<P>
<HR>
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