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           "Sothen,"addedtheengineer,"ProspectHeightswillbecomearegularisland,beingsurroundedwithwateronallsides,andonlycommunicatingwiththerestofourdomainbythebridgewhichweareabouttothrowacrosstheMercy,thetwolittlebridgesalreadyestablishedaboveandbelowthefall;and,lastly,twootherlittlebridgeswhichmustbeconstructed,oneoverthecanalwhichIproposetodig,theotheracrosstotheleftbankoftheMercy.Now,ifthesebridgescanberaisedatwill,ProspectHeightswillbeguardedfromanysurprise."

           Thebridgewasthemosturgentwork.Treeswereselected,cutdown,strippedoftheirbranches,andcutintobeams,joists,andplanks.TheendofthebridgewhichrestedontherightbankoftheMercywastobefirm,buttheotherendontheleftbankwastobemovable,sothatitmightberaisedbymeansofacounterpoise,assomecanalbridgesaremanaged.

           Thiswascertainlyaconsiderablework,andthoughitwasskillfullyconducted,ittooksometime,fortheMercyatthisplacewaseightyfeetwide.Itwasthereforenecessarytofixpilesinthebedoftheriversoastosustainthefloorofthebridgeandestablishapile-drivertoactonthetopsofthesepiles,whichwouldthusformtwoarchesandallowthebridgetosupportheavyloads.

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