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[quote="Geluidforum"]Bleef een interessant onderwerp, dus deel ik even de lezing vanuit de [url=http://en.wikipedia.org/wiki/Hail_cannon]Engelstalige Wikipedia over dit soort apparaten[/url]... [quote="Wikipedia - (August 1th 2014)"][b]Scientific evidence[/b] There is no conclusive evidence in favor of the effectiveness of these devices. A [url=http://www.knmi.nl/publications/fulltexts/hailcannons2_preprint.pdf]2006 review by Jon Wieringa and Iwan Holleman in the journal Meteorologische Zeitschrift (PDF, via KNMI)[/url] summarized a variety of negative and inconclusive scientific measurements, [b]concluding that "the use of cannons or explosive rockets is waste of money and effort"[/b] From a theoretical perspective there is reason to doubt that hail cannons are effective. [b]For example, thunder is a much more powerful sonic wave, and is usually found in the same storm that generates hail, yet doesn't seem to disturb the growth of hailstones.[/b] Charles Knight, a cloud physicist at the National Center for Atmospheric Research in Boulder, Colorado was quoted in a newspaper article of July 10, 2008 as saying, [b]"I don't find anyone in the scientific community who would validate hail cannons, but there are believers in all sorts of things. It would be very hard to prove they don't work, weather being as unpredictable as it is."[/b][/quote] Een [url=http://journals.ametsoc.org/doi/pdf/10.1175/1520-0477%281981%29062%3C0368%3AHRTFHC%3E2.0.CO%3B2]ander en ouder artikel (PDF) vanuit de meteorologie[/url] (via AMS Journals) Een Franse vinding van begin 20e eeuw, zo blijkt na enig zoeken. Er is dus ook tóen al over geschreven: [url=https://dl.dropboxusercontent.com/u/25905883/Geluidforum/1905_hagelkanon.gif]1905 (GIF)[/url] en [url=http://books.google.co.nz/books?id=h-ADAAAAMBAJ&pg=PA548&lpg=PA548&dq=%22hail+cannon%22+france&source=bl&ots=RDW_wSdgS1&sig=GYE54R4fOQYGjKtSniHLdmlY6WU&hl=en&ei=1DqATvefIuySiAfA--DQDg&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEwQ6AEwBQ#v=onepage&q=%22hail%20cannon%22%20france&f=false]1909 (HTML, Google Books)[/url][/quote]
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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Auteur</th> <th class="thCornerR">Bericht</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Geluidforum</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Bericht" title="Bericht" border="0" /><span class="postdetails">Geplaatst: Vr Aug 01, 2014 8:09 pm<span class="gen"> </span> Onderwerp: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Bleef een interessant onderwerp, dus deel ik even de lezing vanuit de <a href="http://en.wikipedia.org/wiki/Hail_cannon" target="_blank" class="postlink">Engelstalige Wikipedia over dit soort apparaten</a>... <br /> <br /></span><table width="90%" cellspacing="1" cellpadding="3" border="0" align="center"><tr> <td><span class="genmed"><b>Wikipedia - (August 1th 2014) schreef:</b></span></td> </tr> <tr> <td class="quote"><span style="font-weight: bold">Scientific evidence</span> <br /> <br />There is no conclusive evidence in favor of the effectiveness of these devices. A <a href="http://www.knmi.nl/publications/fulltexts/hailcannons2_preprint.pdf" target="_blank" class="postlink">2006 review by Jon Wieringa and Iwan Holleman in the journal Meteorologische Zeitschrift (PDF, via KNMI)</a> summarized a variety of negative and inconclusive scientific measurements, <span style="font-weight: bold">concluding that "the use of cannons or explosive rockets is waste of money and effort"</span> <br /> <br />From a theoretical perspective there is reason to doubt that hail cannons are effective. <span style="font-weight: bold">For example, thunder is a much more powerful sonic wave, and is usually found in the same storm that generates hail, yet doesn't seem to disturb the growth of hailstones.</span> <br /> <br />Charles Knight, a cloud physicist at the National Center for Atmospheric Research in Boulder, Colorado was quoted in a newspaper article of July 10, 2008 as saying, <span style="font-weight: bold">"I don't find anyone in the scientific community who would validate hail cannons, but there are believers in all sorts of things. It would be very hard to prove they don't work, weather being as unpredictable as it is."</span></td> </tr></table><span class="postbody"> <br /> <br />Een <a href="http://journals.ametsoc.org/doi/pdf/10.1175/1520-0477%281981%29062%3C0368%3AHRTFHC%3E2.0.CO%3B2" target="_blank" class="postlink">ander en ouder artikel (PDF) vanuit de meteorologie</a> (via AMS Journals) <br /> <br />Een Franse vinding van begin 20e eeuw, zo blijkt na enig zoeken. Er is dus ook tóen al over geschreven: <a href="https://dl.dropboxusercontent.com/u/25905883/Geluidforum/1905_hagelkanon.gif" target="_blank" class="postlink">1905 (GIF)</a> en <a href="http://books.google.co.nz/books?id=h-ADAAAAMBAJ&pg=PA548&lpg=PA548&dq=%22hail+cannon%22+france&source=bl&ots=RDW_wSdgS1&sig=GYE54R4fOQYGjKtSniHLdmlY6WU&hl=en&ei=1DqATvefIuySiAfA--DQDg&sa=X&oi=book_result&ct=result&resnum=6&ved=0CEwQ6AEwBQ#v=onepage&q=%22hail%20cannon%22%20france&f=false" target="_blank" class="postlink">1909 (HTML, Google Books)</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subSilver/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row2"><span class="name"><a name=""></a><b>Geluidforum</b></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subSilver/images/icon_minipost.gif" width="12" height="9" alt="Bericht" title="Bericht" border="0" /><span class="postdetails">Geplaatst: Za Okt 12, 2013 12:14 pm<span class="gen"> </span> Onderwerp: Hagelkanon (anti-hagel-kanon)</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody"><span style="color: red">(gesplitst vanuit <a href="http://www.geluidforum.nl/viewtopic.php?t=1531" target="_blank" class="postlink">dit topic</a>)</span> <br /> <br />En wat denken de heren in dit kader van de Gouden Decibel 2013 nominatie van een (blijkbaar) stiller anti-hagelkanon (fruitteelt), terwijl de werking van het (oorspronkelijke) apparaat al nooit bewezen is? <br /> <br /><a href="http://nl.wikipedia.org/wiki/Hagelkanon" target="_blank">http://nl.wikipedia.org/wiki/Hagelkanon</a> <br /> <br /><a href="http://www.agf.nl/artikel/74470/rss.xml" target="_blank">http://www.agf.nl/artikel/74470/rss.xml</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subSilver/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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