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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear Friends<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If you want to have a very simple PM detector the Bacharach Smoke Detector is one that may suit your budget.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It uses a vacuum cylinder with hand pump and you compare the darkness of the spots on a filter paper with a chart. It turns out the blackness of the spot is a pretty good indicator of the clack carbon content. This is being studied by Berkeley, actually, using photos of filters.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><a href="http://www.uno.co.jp/seihin_info/catalogue/11_environmental/0479.pdf">http://www.uno.co.jp/seihin_info/catalogue/11_environmental/0479.pdf</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>That is the place. Look down on the left side.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards<o:p></o:p></p><p class=MsoNormal>Crispin<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Garamond","serif";color:black;mso-fareast-language:EN-CA'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Garamond","serif";color:black;mso-fareast-language:EN-CA'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>