[SEL] Early Switchboard Meters and Switchgear

[Peter Scales]

In message 
<1398.165.206.180.102.1121711219.squirrel at antique-engines.com>, 
bill at antique-engines.com writes
>Wasn't it Edison who really observed the effect but didn't take or have 
>the time to work with it - and basically the structure of a light bulb 
>became the basis for the first "valve" - so called because of the 
>one-way flow of electrons.

For those interested, there is a really good history of the "valve" 
here:

http://www.radio-electronics.com/info/radio_history/valve/hov.php

Edison is credited with observation of thermionic effects in the late 
1880's, Fleming with the first practical application at about the turn 
of the 20th century, but it was deForest in about 1913 (?) who 
demonstrated amplification in his "audion" valve (vacuum tube).  You all 
know what happened next :-)

Regards

      Pete
-- 
Peter Scales