1 ▁ 1 1 s ▁ 1 0 d . ▁The ▁arch ▁design ▁was ▁che aper ▁than ▁alternative ▁cant ile ver ▁and ▁susp ension ▁bridge ▁propos als , ▁and ▁also ▁provided ▁greater ▁rig id ity ▁making ▁it ▁better ▁su ited ▁for ▁the ▁heavy ▁loads ▁expected . ▁ ▁Brad field ▁and ▁his ▁staff ▁were ▁ultimately ▁to ▁over see ▁the ▁bridge ▁design ▁and ▁building ▁process ▁as ▁it ▁was ▁executed ▁by ▁D orm an ▁Long ▁and ▁Co , ▁whose ▁Cons ult ing ▁Engine er , ▁Sir ▁Ralph ▁Fre eman ▁of ▁Sir ▁Douglas ▁Fox ▁and ▁Part ners , ▁and ▁his ▁associate ▁Mr . ▁G . C . ▁Im b ault , ▁carried ▁out ▁the ▁detailed ▁design ▁and ▁ere ction ▁process ▁of ▁the ▁bridge . ▁Arch itect s ▁for ▁the ▁contract ors ▁were ▁from ▁the ▁British ▁firm ▁John ▁Burn et ▁& ▁Part ners ▁of ▁Glasgow , ▁Scotland . ▁Lawrence ▁En nis , ▁of ▁D orm an ▁Long , ▁served ▁as ▁Director ▁of ▁Const ruction ▁and ▁primary ▁on site ▁super visor ▁throughout ▁the ▁entire ▁build , ▁alongside ▁Edward ▁Judge , ▁D orm an ▁Long ' s ▁Chief ▁Techn ical ▁Engine er , ▁who ▁function ed ▁as ▁Cons ult ing ▁and ▁Design ing ▁Engine er . ▁ ▁The ▁building ▁of ▁the ▁bridge ▁coinc ided ▁with ▁the ▁construction ▁of ▁a ▁system ▁of ▁under ground ▁rail ways ▁in ▁Sydney ' s ▁C BD , ▁known ▁today ▁as ▁the ▁City ▁Circle , ▁and ▁the ▁bridge ▁was ▁designed ▁with ▁this ▁in ▁mind . ▁The ▁bridge ▁was ▁designed ▁to ▁carry ▁six ▁lan es ▁of ▁road