. ▁Non eth eless , ▁pul ver ised ▁coal ▁would ▁still ▁be ▁used ▁in ▁bo iler ▁number ▁ 1 1 . ▁ ▁The ▁“ new ▁bo iler ▁room ”, ▁as ▁it ▁was ▁called , ▁grew ▁south ward , ▁toward ▁the ▁Tag us ▁River , ▁with ▁the ▁fac ade ▁facing ▁the ▁river ▁and ▁remaining ▁un fin ished , ▁tempor arily ▁closed ▁off ▁with ▁a ▁sheet ▁of ▁z inc ▁and ▁a ▁met all ic ▁structure ▁im it ating ▁the ▁bay ▁windows ▁on ▁the ▁opposite ▁side . ▁This ▁because ▁a ▁third ▁and ▁final ▁expansion ▁was ▁anticip ated ▁for ▁this ▁low ▁pressure ▁bo iler ▁room . ▁Bo ilers ▁ 7 ▁and ▁ 9 , ▁both ▁Bab cock ▁& ▁Wil co x , ▁were ▁the ▁first ▁to ▁be ▁installed ▁in ▁this ▁new ▁space ▁in ▁ 1 9 2 4 ▁and ▁ 1 9 2 5 ▁respectively . ▁The ▁third , ▁bo iler ▁ 1 1 ▁– ▁a ▁H umb old t ▁– ▁was ▁installed ▁in ▁ 1 9 2 8 ; ▁since ▁it ▁used ▁pul ver ised ▁coal , ▁it ▁had ▁its ▁own ▁coal ▁mill . ▁ ▁The ▁mach in ery ▁room ▁didn ’ t ▁under go ▁any ▁change ▁in ▁size ▁but ▁inside , ▁ ▁an ▁ 8 MW ▁generating ▁set ▁– ▁number ▁ 4 , ▁a ▁St al - A se a ▁– ▁was ▁installed ▁in ▁ 1 9 2 5 . ▁The ▁channels ▁and ▁two ▁si ph ons ▁on ▁the ▁cool ing ▁system ' s ▁new ▁do cks ▁were ▁also ▁built , ▁which ▁carried ▁water ▁from