Таинственный остров

           Thispieceofsteel,afterhavingbeentempered,wasfixedinasfirmawayaspossibleinasolidframeworkplantedintheground,onlyafewfeetfromthegreatfall,themotivepowerofwhichtheengineerintendedtoutilize.Infactasthefulling-millwasthere,althoughnottheninuse,itsbeammovedwithextremepowerwouldservetostretchoutthewirebyrollingitrounditself.Itwasadelicateoperation,andrequiredmuchcare.Theiron,preparedpreviouslyinlongthinrods,theendsofwhichweresharpenedwiththefile,havingbeenintroducedintothelargestholeofthedrawplate,wasdrawnoutbythebeamwhichwounditrounditself,toalengthoftwenty-fiveorthirtyfeet,thenunrolled,andthesameoperationwasperformedsuccessivelythroughtheholesofalesssize.Finally,theengineerobtainedwiresfromfortytofiftyfeetlong,whichcouldbeeasilyfastenedtogetherandstretchedoverthedistanceoffivemiles,whichseparatedthecorralfromtheboundsofGraniteHouse.

           Itdidnottakemorethanafewdaystoperformthiswork,andindeedassoonasthemachinehadbeencommenced,CyrusHardinglefthiscompanionstofollowthetradeofwiredrawers,andoccupiedhimselfwithmanufacturinghisbattery.

           Itwasnecessarytoobtainabatterywithaconstantcurrent.Itisknownthattheelementsofmodernbatteriesaregenerallycomposedofretortcoal,zinc,andcopper.

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