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Spark Gap

Just got the new Fair Radio Sales catalog yesterday and it had an
interesting item on the front cover: SPARK GAP   :  Clear plastic
construction with removable ends. Adjustable spark gap with 3.9 inch
diameter balls. Gasketed to allow vacuum or gas environment for balls.
Pressure information is unknown. Takes 3/8 in. plastic tubing for intake on
each end.  o/a 15.5"L X 9" dia. 13 lbs.   #SG-4 used  $99.50   They have a
web site at:   FAIRRADIO-dot-com
  I may have to get me one of these.

George Stein