▁office ▁of ▁the ▁Ins pect or ▁General ▁of ▁Fort ifications . ▁In ▁ 1 8 1 9 , ▁he ▁married ▁Elizabeth ▁Clement s , ▁who ▁bore ▁him ▁three ▁sons ▁and ▁a ▁daughter . ▁Another ▁son ▁was ▁to ▁be ▁born ▁later ▁in ▁Sydney , ▁New ▁South ▁Wales . ▁Lewis ▁lived ▁in ▁the ▁E y re ▁Est ate ▁at ▁ 1 1 ▁South ▁Bank , ▁near ▁St ▁Joh ns ▁Wood . ▁After ▁eight ▁years ▁in ▁private ▁practice , ▁Lewis ▁received ▁an ▁appointment ▁as ▁assistant ▁survey or ▁in ▁the ▁office ▁of ▁survey or - general ▁of ▁New ▁South ▁Wales . ▁He ▁set ▁sail ▁with ▁his ▁family ▁in ▁ 1 8 2 9 ▁and ▁arrived ▁in ▁Sydney ▁in ▁March , ▁ 1 8 3 0 . ▁ ▁Career ▁in ▁Australia ▁Lewis ▁arrived ▁in ▁Sydney ▁via ▁Hob art ▁on ▁ 1 ▁April ▁ 1 8 3 0 ▁as ▁a ▁free ▁sett ler ▁ab o ard ▁the ▁conv ict ▁ship ▁the ▁Dun ve gan ▁Castle , ▁which ▁left ▁Britain ▁on ▁ 2 8 ▁September ▁ 1 8 2 9 . ▁ ▁From ▁ 1 8 3 0 ▁Lewis ▁worked ▁in ▁the ▁office ▁of ▁survey or - general ▁of ▁New ▁South ▁Wales ▁under ▁Sir ▁Thomas ▁Mitchell , ▁and ▁during ▁this ▁time ▁mapped ▁the ▁Great ▁D ivid ing ▁Range , ▁ 1 3 0 ▁kilometres ▁west ▁of ▁Sydney . ▁Lewis ▁was ▁appointed ▁to ▁be ▁the ▁Town ▁Survey or ; ▁in ▁ 1 8 3 5 ▁he ▁was ▁further ▁promoted ▁to ▁the ▁position ▁of ▁Col onial ▁Arch itect ▁which ▁he ▁held ▁for