<html> <head> <style></style> </head> <body class='hmmessage'><div dir='ltr'> <div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; ">Hi....</span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><br></span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; ">Let's put this to a test!</span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><br></span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; ">With all the flooding we are having in Montana this summer the clouds of mosquitos are really fierce! Our family is visiting with their PCs and I have a Mac. We can try this in the next couple of days and see if it really works. It says it can be barely audible. I was curious to see how low these notes would be and found this interesting chart (link below). Many of the instruments listed are no longer in daily use and exist mainly in museums, but some, such as the bass viol and bassoon are very common. In fact, my husband has his bassoon here with him in Montana! But, I don't think he wants to play a continuous low note... he has better things to do! We can find an appropriate tone generator for our test.</span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><br></span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><a href="http://www.contrabass.com/pages/frequency.html">http://www.contrabass.com/pages/frequency.html</a></span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><br></span></font></div><div><font class="Apple-style-span" face="Verdana"><span class="Apple-style-span" style="font-size: 10pt; "><a href="http://www.contrabass.com/pages/frequency.html"></a>Caryl<br></span></font><br><div>> Date: Fri, 8 Jul 2011 15:34:30 +1000<br>> From: quozl@laptop.org<br>> To: sean@lpnz.org<br>> CC: olpc-oceania@lists.laptop.org; iaep@lists.sugarlabs.org; sugar-devel@lists.sugarlabs.org; develop@worldclassproject.org.uk<br>> Subject: Re: [IAEP] [Sugar-devel] Turn your frequency generator into a super powerful mosquito repeller<br>> <br>> The speakers don't work very well at the frequency range specified by<br>> that article for mosquito repelling; 45 Hz to 67 Hz.<br>> <br>> The article fails to mention how much sound is needed; e.g. in dBm. It<br>> gives a subjective measure only.<br>> <br>> Other articles on the site mention secrets of ancient geometry and<br>> crystal harmonizers. This really doesn't impress me. Is there any<br>> evidence base for repelling mosquitos using low frequency sound? Is<br>> there any evidence that enough of the population of mosquitos is<br>> repelled? All it takes is for one strain to not be repelled and it will<br>> breed up.<br>> <br>> -- <br>> James Cameron<br>> http://quozl.linux.org.au/<br>> _______________________________________________<br>> IAEP -- It's An Education Project (not a laptop project!)<br>> IAEP@lists.sugarlabs.org<br>> http://lists.sugarlabs.org/listinfo/iaep<br></div></div> </div></body> </html>