\"Yes.Thewireshavenoground-connectionoutsideofthecave.Theygooutfromthepositivebrushofthedynamo;thereisaground-connectionthroughthenegativebrush;theotherendsofthewirereturntothecave,andeachisgroundedindependently.\"
\"Nono,thatwon\'tdo!\"
\"Why?\"
\"It\'stooexpensive——usesupforcefornothing.Youdon\'twantanyground-connectionexcepttheonethroughthenegativebrush.Theotherendofeverywiremustbebroughtbackintothecaveandfastenedindependently,andWITHOUTanyground-connection.Now,then,observetheeconomyofit.
Acavalrychargehurlsitselfagainstthefence;youareusingnopower,youarespendingnomoney,forthereisonlyoneground-connectiontillthosehorsescomeagainstthewire;themomenttheytouchittheyformaconnectionwiththenegativebrushTHROUGHTHEGROUND,anddropdead.