Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!deimos.cis.ksu.edu!rutgers!sun-barr!male!pitstop!sundc!seismo!uunet!portal!cup.portal.com!mmm
From: mmm@cup.portal.com (Mark Robert Thorson)
Newsgroups: sci.electronics
Subject: Re: wireless electricity
Message-ID: <17774@cup.portal.com>
Date: 30 Apr 89 16:46:02 GMT
References: <gYJRpyy00WB-E57Uwj@andrew.cmu.edu> <913@snjsn1.SJ.ATE.SLB.COM>
Organization: The Portal System (TM)
Lines: 7

If I'm not mistaken, Tesla's plan was to set the earth-air-ionosphere cavity
into resonance with a wave of about 10 Hz.  You would draw power from this
wave using an antenna.

Some of Tesla's speculations became interesting during Project Sanguine
and Project Seafarer, which were programs to develop an ELF transmitter
for communication to submarines.  (ELF is the band from 2000 Hz down to DC.)