Warning: Use of undefined constant add_shortcode - assumed 'add_shortcode' (this will throw an Error in a future version of PHP) in /nfs/c03/h02/mnt/49321/domains/hackingtheuniverse.com/html/wp-content/plugins/stray-quotes/stray_quotes.php on line 615

Warning: Use of undefined constant MSW_WPFM_FILE - assumed 'MSW_WPFM_FILE' (this will throw an Error in a future version of PHP) in /nfs/c03/h02/mnt/49321/domains/hackingtheuniverse.com/html/wp-content/plugins/wordpress-file-monitor/wordpress-file-monitor.php on line 39
Tag: geissler

Archive for geissler

You are browsing the archives of geissler.

1854 – mercury vacuum pump

In 1854, Heinrich Geissler invented the mercury displacement vacuum pump, which led to high quality vacuum tubes, which in turn led to the invention of the transistor. PRECURSOR: -0460 – Democritus 1206 – suction pump 1643 – barometer 1650 – vacuum pump SUBSEQUENT: 1855 – vacuum tube 1875 – Crookes’ tube 1897 – electron discovered […]

1855 – vacuum tube

Heinrich Geissler and Julius Plucker use Geisslers new mercury vacuum pump to evacuate the atomosphere inside a glass tube. Plucker, a young professor at the University of Bonn, discovered that a glowing stream could be produced when electricity was passed through electrodes embedded in the glass tubes and that the stream responded to a magnet. […]