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Chapter 12. Everything through Electricity

           Thereisverylittlelabourspentinattainingthelowerregionsoftheocean,forallbodieshaveatendencytosink.WhenIwantedtofindoutthenecessaryincreaseofweightrequiredtosinktheNautilus,Ihadonlytocalculatethereductionofvolumethatsea-wateracquiresaccordingtothedepth."

           "Thatisevident."

           "Now,ifwaterisnotabsolutelyincompressible,itisatleastcapableofveryslightcompression.Indeed,afterthemostrecentcalculationsthisreductionisonly.000436ofanatmosphereforeachthirtyfeetofdepth.Ifwewanttosink3,000feet,Ishouldkeepaccountofthereductionofbulkunderapressureequaltothatofacolumnofwaterofathousandfeet.Thecalculationiseasilyverified.Now,Ihavesupplementaryreservoirscapableofholdingahundredtons.ThereforeIcansinktoaconsiderabledepth.WhenIwishtorisetothelevelofthesea,Ionlyletoffthewater,andemptyallthereservoirsifIwanttheNautilustoemergefromthetenthpartofhertotalcapacity."

           Ihadnothingtoobjecttothesereasonings.

           "Iadmityourcalculations,Captain,"Ireplied;"Ishouldbewrongtodisputethemsincedailyexperienceconfirmsthem;butIforeseearealdifficultyintheway."

           "What,sir?"

           "Whenyouareabout1,000feetdeep,thewallsoftheNautilusbearapressureof100atmospheres.

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