) ▁Pet rie ▁Mill , ▁which ▁comm enced ▁manufact uring ▁operations ▁in ▁ 1 9 5 7 . ▁ ▁In ▁ 1 9 5 4 , ▁the ▁Stanley ▁building ▁was ▁extended ▁to ▁the ▁east ▁by ▁ ▁and ▁a ▁partition ▁was ▁inserted ▁to ▁make ▁two ▁class rooms , ▁while ▁the ▁cas ement ▁windows ▁in ▁the ▁north - east ▁and ▁south - west ▁ver and ah ▁walls ▁were ▁replaced ▁with ▁colonial ▁hung ▁s ash es . ▁The ▁door ▁into ▁the ▁Fer g us on ▁building ▁was ▁removed ▁( it ▁was ▁later ▁re inst ated , ▁off ▁centre ), ▁and ▁the ▁Fer g us on ▁building ▁was ▁also ▁partition ed ▁into ▁two ▁class rooms . ▁ ▁In ▁ 1 9 5 6 ▁the ▁school ▁was ▁renamed ▁Pet rie ▁State ▁School . ▁Ar ound ▁ 1 9 5 6 ▁a ▁new ▁high - set ▁class room , ▁with ▁play ▁space ▁under ne ath , ▁was ▁built ▁to ▁the ▁north ▁of ▁the ▁Fer g us on ▁building , ▁connected ▁by ▁a ▁raised ▁walk way ▁extension ▁of ▁the ▁latter ' s ▁western ▁ver and ah . ▁In ▁ 1 9 6 2 ▁an ▁additional ▁class room ▁was ▁constructed ▁in ▁the ▁space ▁between ▁the ▁two ▁buildings , ▁resulting ▁in ▁the ▁loss ▁of ▁the ▁windows ▁in ▁the ▁north - east ▁wall ▁of ▁the ▁Fer g us on ▁building . ▁ ▁The ▁district ' s ▁population ▁continued ▁to ▁increase ▁during ▁the ▁ 1 9 6 0 s ▁and ▁ 1 9 7 0 s . ▁By ▁ 1 9 6 4 ,