<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div class="ydp37d1a21fyahoo-style-wrap" style="font-family: times new roman, new york, times, serif; font-size: 16px;"><div><div dir="ltr" data-setdir="false">Randy,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">That does look like fun. I'm sure I have a spare coil around.</div><div dir="ltr" data-setdir="false">Of course they can develop a lot of current if fed with the right voltage.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Here is a simple demonstration that explains the utility of a coherer and how</div><div dir="ltr" data-setdir="false">it is able to detect a spark gap transmission.</div><div dir="ltr" data-setdir="false">The demonstration shows how to make a coherer out of some bolts, iron filings, and plastic tubing.</div><div dir="ltr" data-setdir="false">It also shows how to make a very safe spark transmitter from a barbecue igniter.</div><div dir="ltr" data-setdir="false">Very well done and accessible to even young museum visitors. The entire article is available</div><div dir="ltr" data-setdir="false">as a downloadable PDF.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"><span><a href="https://www.researchgate.net/publication/230901202_The_coherer_With_simple_demonstrations_of_the_generation_propagation_and_detection_of_radio_waves" rel="nofollow" target="_blank" class="enhancr_card_7250408346">(PDF) The coherer: With simple demonstrations of the generation, propagation and detection of radio waves</a></span><div><br></div><div id="ydp5dc671cfenhancr_card_7250408346" class="ydp5dc671cfyahoo-link-enhancr-card ydp5dc671cfymail-preserve-class ydp5dc671cfymail-preserve-style" style="max-width:400px;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif" data-url="https://www.researchgate.net/publication/230901202_The_coherer_With_simple_demonstrations_of_the_generation_propagation_and_detection_of_radio_waves" data-type="YENHANCER" data-size="MEDIUM" contenteditable="false"><a href="https://www.researchgate.net/publication/230901202_The_coherer_With_simple_demonstrations_of_the_generation_propagation_and_detection_of_radio_waves" style="text-decoration:none !important;color:#000 !important" class="ydp5dc671cfyahoo-enhancr-cardlink" rel="nofollow" target="_blank"><table border="0" class="ydp5dc671cfcard-wrapper ydp5dc671cfyahoo-ignore-table" cellpadding="0" cellspacing="0" style="max-width:400px"><tbody><tr><td width="400"><table border="0" class="ydp5dc671cfcard ydp5dc671cfyahoo-ignore-table" cellpadding="0" cellspacing="0" width="100%" style="max-width:400px;border-width:1px;border-style:solid;border-color:rgb(224, 228, 233);border-radius:2px"><tbody><tr><td class="ydp5dc671cfcard-primary-image-cell" background="https://s.yimg.com/lo/api/res/1.2/4_hltBAwe0E4zTUgdvWlaQ--~A/Zmk9ZmlsbDt3PTQwMDtoPTIwMDthcHBpZD1pZXh0cmFjdA--/https://i1.rgstatic.net/publication/230901202_The_coherer_With_simple_demonstrations_of_the_generation_propagation_and_detection_of_radio_waves/links/5690e5ad08aec14fa55a3c93/largepreview.png.cf.jpg" bgcolor="#000000" valign="top" height="175" style="background-color: rgb(0, 0, 0); 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min-height: 175px;"><tbody><tr><td class="ydp5dc671cfcard-richInfo2" style="text-align:left;padding:15px 0 0 15px;vertical-align:top"></td><td class="ydp5dc671cfcard-actions" style="text-align:right;padding:15px 15px 0 0;vertical-align:top"><div class="ydp5dc671cfcard-share-container"></div></td></tr></tbody></table><!--[if gte mso 9]></v:textbox></v:rect><![endif]--></td></tr></tbody></table></td></tr><tr><td><table border="0" align="center" class="ydp5dc671cfcard-info ydp5dc671cfyahoo-ignore-table" cellpadding="0" cellspacing="0" style="background:#fff;position:relative;z-index:2;width:100%;max-width:400px;border-radius:0 0 2px 2px;border-top:1px solid rgb(224, 228, 233)"><tbody><tr><td style="background-color:#ffffff;padding:16px 0 16px 12px;vertical-align:top;border-radius:0 0 0 2px"></td><td style="vertical-align:middle;padding:12px 24px 16px 12px;width:99%;font-family:Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif;border-radius:0 0 2px 0"><h2 class="ydp5dc671cfcard-title" style="font-size: 14px; line-height: 19px; margin: 0px 0px 6px; font-family: Helvetica Neue, Segoe UI, Helvetica, Arial, sans-serif; color: rgb(38, 40, 42); max-width: 314px;">(PDF) The coherer: With simple demonstrations of the generation, propaga...</h2><p class="ydp5dc671cfcard-description" style="font-size: 12px; line-height: 16px; margin: 0px; color: rgb(151, 155, 167);">PDF | A coherer is a bistable device based on metal filings loosely confined between solid metal electrodes. Thi...</p></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></a></div><div><br></div><div><br></div><br></div><div><br></div><div class="ydp37d1a21fsignature"><div style="font-family:times new roman, new york, times, serif;font-size:16px;"><p style="font-family:garamond, times, serif;font-size:16px;"></p><hr style="font-family:garamond, times, serif;font-size:16px;"><p style="font-family:garamond, times, serif;font-size:16px;"></p><div style="font-family:garamond, times, serif;font-size:16px;"><font face="arial, helvetica, sans-serif"><font size="2"><b>Ken Carr</b> ... </font></font></div><div dir="ltr"><font face="arial, helvetica, sans-serif" size="2"><a href="http://www.idlenot.com" rel="nofollow" target="_blank">KE1RI, A New England Ham</a></font></div><div dir="ltr"><a href="http://www.wpraaca.com" rel="nofollow" target="_blank">Westerly-Pawcatuck AACA</a></div><div dir="ltr"><a href="https://www.newsm.org" rel="nofollow" target="_blank">N.E. Steam & Wireless Museum</a></div><p style="font-family:garamond, times, serif;font-size:16px;"><img src="http://farm1.static.flickr.com/67/204475342_02d2af35ac_t.jpg" data-inlineimagemanipulating="true" class="" data-id="1586442071565"></p></div></div></div>
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On Friday, March 27, 2020, 06:59:49 PM EDT, Randall Snow via Thursday <thursday@newsm.org> wrote:
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<div><div id="ydpbde18141yiv9243122231"><div>Hi guys,<div><br></div><div>I just saw something pretty fun for today. This guy has been doing videos on electricity for years and is well known for both his unibrow and electrocuting himself. The focus of his latest video is spark gap transmission and he has a pretty neat detector in there too. Enjoy!</div><div><br></div><div><a href="https://youtu.be/SnKKj2bonAI" rel="nofollow" target="_blank">https://youtu.be/SnKKj2bonAI</a><br></div><div><br></div></div></div>_______________________________________________<br>Thursday mailing list<br><a href="mailto:Thursday@host194.hostmonster.com" rel="nofollow" target="_blank">Thursday@host194.hostmonster.com</a><br><a href="http://host194.hostmonster.com/mailman/listinfo/thursday_newsm.org" rel="nofollow" target="_blank">http://host194.hostmonster.com/mailman/listinfo/thursday_newsm.org</a><br></div>
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