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  <div class="vevent h-event"> <h1 class="summary p-name">EAST Knowledge - Going Back in Time for Some Vintage Howdunit</h1> <div class='date'><time class="dtstart dt-start" title="2015-10-24T10:30:00" datetime="2015-10-24T10:30:00">Saturday, October 24, 2015 from 10:30am</time>–<time class="dtend dt-end" title="2015-10-24T12:00:00" datetime="2015-10-24T12:00:00">noon</time></div> <div class="location vcard p-location h-card"> <a class="url" href='http://calagator.org/venues/202395090'><span class='fn org p-name'>Gresham Library Meeting Room</span></a> <div class="adr p-adr h-adr"> <div class="street-address p-street-address">385 NW Miller Ave</div> <span class="locality p-locality">Gresham</span> , <span class="region p-region">OR</span> <span class="postal-code p-postal-code">97030</span> <div class="country-name p-country-name">US</div> (<a href='https://maps.google.com/maps?q=385%20NW%20Miller%20Ave,%20Gresham%20OR%2097030%20US'>map</a>) </div> </div> <div class="description p-description"> <p>EAST Knowledge invites you to attend our sixth meeting! <em>All</em> are welcome!</p> <strong>What:</strong> Going Back in Time for Some Vintage Howdunit <strong>Who:</strong> Bill Howland <strong>Where</strong> The Meeting Room at the Gresham Library <strong>When:</strong> 10:30am-Noon, Saturday, October 24th, 2015 <strong>Why:</strong> Sharing what we know <p>Bill Howland will re-introduce us to vacuum tubes and their uses. He will:</p> <ul> <li>Give a summary of the origins of vacuum and gas diodes and related thermionic devices</li> <li>Have show-n-tell demonstrations of the earliest and simplest of such devices: The diode.</li> </ul> <p>Come and learn something old!</p> <p>Vacuum tube diodes were put to use in the early days of radio as "detectors", because they were more robust and reliable than crystal, mechanical, and chemical contrivances used for this purpose. With further development, thermionic vacuum and gas diodes advanced to be capable of power rectification with ever greater efficiencies.</p> <p>Many example devices from the 1930's to 1950's will be available to examine. There will be orange, purple, and blue glows in the demonstrations!</p> <p>Bill shares some of his projects on his blog: <a href="https://evilscienceaudio.wordpress.com">Evil Science Audio</a></p> </div> <h3>Links</h3> <ul> <li><a class="url u-url" href="http://eastknow.org">Website</a></li> </ul> </div>