Путешествие на Луну

The Hymn of the Cannon-Ball

           "Hollow?thenitwouldbeashell?"

           "Yes,ashell,"repliedBarbicane;"decidelyitmustbe.Asolidshotof108incheswouldweighmorethan200,000pounds,aweightevidentlyfartoogreat.Still,aswemustreserveacertainstabilityforourprojectile,Iproposetogiveitaweightof20,000pounds."

           "What,then,willbethethicknessofthesides?"askedthemajor.

           "Ifwefollowtheusualproportion,"repliedMorgan,"adiameterof108incheswouldrequiresidesoftwofeetthickness,orless."

           "Thatwouldbetoomuch,"repliedBarbicane;"foryouwillobservethatthequestionisnotthatofashotintendedtopierceanironplate;itwillsufficetogiveitsidesstrongenoughtoresistthepressureofthegas.Theproblem,therefore,isthisWhatthicknessoughtacast-ironshelltohaveinordernottoweightmorethan20,000pounds?Ourcleversecretarywillsoonenlightenusuponthispoint."

           "Nothingeasier."repliedtheworthysecretaryofthecommittee;and,rapidlytracingafewalgebraicalformulaeuponpaper,amongwhichn^2andx^2frequentlyappeared,hepresentlysaid:

           "Thesideswillrequireathicknessoflessthantwoinches."

           "Willthatbeenough?"askedthemajordoubtfully.

           "Clearlynot!"repliedthepresident.

           "Whatistobedone,then?"saidElphinstone,withapuzzledair.

           "Employanothermetalinsteadofiron."

           "Copper?"saidMorgan.

           "No!thatwouldbetooheavy.Ihavebetterthanthattooffer."

           "Whatthen?"askedthemajor.

           "Aluminum!"repliedBarbicane.

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