ite ▁for ▁the ▁bridge ▁p yl ons . ▁The ▁st on em asons ▁cut , ▁dressed , ▁and ▁number ed ▁the ▁blocks , ▁which ▁were ▁then ▁transport ed ▁to ▁Sydney ▁on ▁three ▁ships ▁built ▁specifically ▁for ▁this ▁purpose . ▁The ▁Mor u ya ▁quar ry ▁was ▁managed ▁by ▁John ▁Gil more , ▁a ▁Scottish ▁st on em ason ▁who ▁em igr ated ▁with ▁his ▁young ▁family ▁to ▁Australia ▁in ▁ 1 9 2 4 , ▁at ▁the ▁request ▁of ▁the ▁project ▁man agers . ▁The ▁concrete ▁used ▁was ▁also ▁Australian - made ▁and ▁supplied ▁from ▁K and os , ▁New ▁South ▁Wales . ▁ ▁Ab ut ments ▁at ▁the ▁base ▁of ▁the ▁p yl ons ▁are ▁essential ▁to ▁support ▁the ▁loads ▁from ▁the ▁arch ▁and ▁hold ▁its ▁span ▁firm ly ▁in ▁place , ▁but ▁the ▁p yl ons ▁themselves ▁have ▁no ▁struct ural ▁purpose . ▁They ▁were ▁included ▁to ▁provide ▁a ▁frame ▁for ▁the ▁arch ▁pan els ▁and ▁to ▁give ▁better ▁visual ▁balance ▁to ▁the ▁bridge . ▁The ▁p yl ons ▁were ▁not ▁part ▁of ▁the ▁original ▁design , ▁and ▁were ▁only ▁added ▁to ▁all ay ▁public ▁concern ▁about ▁the ▁struct ural ▁integrity ▁of ▁the ▁bridge . ▁ ▁Although ▁originally ▁added ▁to ▁the ▁bridge ▁sole ly ▁for ▁their ▁a est h etic ▁value , ▁all ▁four ▁p yl ons ▁have ▁now ▁been ▁put ▁to ▁use . ▁The ▁south - e astern ▁p yl on ▁contains ▁a ▁museum ▁and ▁tour ist ▁centre , ▁with ▁a ▁ 3 6 0 ° ▁look out ▁at ▁the