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History of the Cannon

           "Whatistheruleinsuchacase?"

           "Ordinarilythelengthofagunistwentytotwenty-fivetimesthediameteroftheshot,anditsweighttwohundredandthirty-fivetotwohundredandfortytimesthatoftheshot."

           "Thatisnotenough,"criedJ.T.Mastonimpetuously.

           "Iagreewithyou,mygoodfriend;and,infact,followingthisproportionforaprojectileninefeetindiameter,weighing30,000pounds,thegunwouldonlyhavealengthoftwohundredandtwenty-fivefeet,andaweightof7,200,000pounds."

           "Ridiculous!"rejoinedMaston."Aswelltakeapistol."

           "Ithinksotoo,"repliedBarbicane;"thatiswhyIproposetoquadruplethatlength,andtoconstructagunofninehundredfeet."

           Thegeneralandthemajorofferedsomeobjections;nevertheless,theproposition,activelysupportedbythesecretary,wasdefinitelyadopted.

           "But,"saidElphinstone,"whatthicknessmustwegiveit?"

           "Athicknessofsixfeet,"repliedBarbicane.

           "Yousurelydon’tthinkofmountingamasslikethatuponacarriage?"askedthemajor.

           "Itwouldbeasuperbidea,though,"saidMaston.

           "Butimpracticable,"repliedBarbicane."No,Ithinkofsinkingthisengineintheearthalone,bindingitwithhoopsofwroughtiron,andfinallysurroundingitwithathickmassofmasonryofstoneandcement.Thepieceoncecast,itmustbeboredwithgreatprecision,soastoprecludeanypossiblewindage.Sotherewillbenolosswhateverofgas,andalltheexpansiveforceofthepowderwillbeemployedinthepropulsion."

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