small spark

Subject:  small spark
  Date:  Tue, 10 Jun 1997 12:23:33 +0300
  From: Kenneth Aaron <kennetha-at-geocities-dot-com>
    To: tesla-at-pupman-dot-com, hvlist-at-anchorage.ab.umd.edu

when I pull a spark off a small solid state TC with 
a screw driver  I get a 1" spark.
when I touch the HV output of the TC with the screwdriver and try to
a spark off this screwdriver with another one I get only a 1/4" spark.
why is this ? (the first screwdriver is touchng the HV) 

Kenneth Aaron 
E-mail : kennetha-at-geocities-dot-com