Change 36314

Time Attribute with previous and current values
Change #36314
2015-10-11
11:50:52

update Calagator::Event 1250469209 EAST Knowledge - Going Back in Time for Some Vintage Howdunit Roll back

description EAST Knowledge invites you to attend our sixth meeting! *All* are welcome! * **What:** Going Back in Time for Some Vintage Howdunit * **Who:** Bill Howland * **Where:** The Meeting Room at the Gresham Library * **When:** 10:30am-Noon, Saturday, October 24th, 2015 * **Why:** Sharing what we know Bill Howland will re-introduce us to vacuum tubes and their uses. He will: * Give a summary of the origins of vacuum and gas diodes and related thermionic devices * Have show-n-tell demonstrations of the earliest and simplest of such devices: The diode. Come and learn something old! 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. 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! → EAST Knowledge invites you to attend our sixth meeting! *All* are welcome! * **What:** Going Back in Time for Some Vintage Howdunit * **Who:** Bill Howland * **Where:** The Meeting Room at the Gresham Library * **When:** 10:30am-Noon, Saturday, October 24th, 2015 * **Why:** Sharing what we know Bill Howland will re-introduce us to vacuum tubes and their uses. He will: * Give a summary of the origins of vacuum and gas diodes and related thermionic devices * Have show-n-tell demonstrations of the earliest and simplest of such devices: The diode. Come and learn something old! 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. 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! Bill shares some of his projects on his blog: [Evil Science Audio](https://evilscienceaudio.wordpress.com)