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1930s photo of tesla coil



Original poster: "Alfred Erpel" <alfred-at-erpel-dot-com> 



Looks like a half wave tesla coil.  Note the huge air capacitor at their
feet.



http://memory.loc.gov/cgi-bin/query/I?cdn:1:./temp/~ammem_wRTB::displayType=1:m856sd=ichicdn:m856sf=n064680:-at--at--at-cd