▁was ▁being ▁developed ▁commer cially ▁at ▁nearby ▁Mill wall ). ▁New ▁buildings ▁were ▁constructed ▁on ▁the ▁site ▁for ▁steam ▁manufact uring ▁and ▁maintenance , ▁including ▁a ▁bo iler ▁shop ▁for ▁manufact uring ▁bo ilers , ▁found ries ▁for ▁br ass , ▁co pper ▁and ▁iron ▁work , ▁and ▁an ▁ere ct ing ▁shop ▁for ▁assemb ling ▁the ▁steam ▁engines ; ▁by ▁ 1 8 4 3 ▁all ▁were ▁integrated ▁into ▁a ▁single ▁factory ▁complex , ▁with ▁a ▁single ▁large ▁chim ney ▁drawing ▁on ▁all ▁the ▁various ▁for ges ▁and ▁furn aces ▁by ▁way ▁of ▁under ground ▁fl ues . ▁Integr al ▁to ▁the ▁creation ▁of ▁the ▁steam ▁factory ▁was ▁the ▁conversion ▁of ▁two ▁m ast ▁p onds ▁( which ▁lay ▁to ▁the ▁north ▁of ▁what ▁is ▁now ▁R ust on ▁Road ) ▁into ▁steam ▁bas ins , ▁where ▁ships ▁could ▁mo or ▁alongside ▁the ▁factory ▁while ▁their ▁engines ▁and ▁bo ilers ▁were ▁fitted . ▁One ▁of ▁these ▁bas ins ▁was ▁provided ▁with ▁its ▁own ▁dry ▁dock ▁( No . ▁ 1 ▁D ock ) ▁which , ▁like ▁the ▁bas ins , ▁was ▁filled ▁in ▁and ▁built ▁over ▁in ▁the ▁ 2 0 th ▁century . ▁The ▁factory ▁was ▁part ▁of ▁the ▁dock yard , ▁but ▁had ▁a ▁high ▁degree ▁of ▁independence : ▁it ▁was ▁accessed ▁by ▁its ▁own ▁gate ▁( known ▁as ▁the ▁West ▁Gate ▁or ▁Ste am ▁Factory ▁Gate ) ▁and ▁over seen ▁by ▁its ▁own ▁official , ▁the ▁Chief ▁Engine er . ▁ ▁W ool wich ▁retained ▁its ▁prim acy ▁as