▁Galerie ▁des ▁machines , ▁by ▁the ▁architect ▁Ferdinand ▁D ut ert ▁and ▁engineer ▁Victor ▁Cont amin , ▁which ▁had ▁originally ▁been ▁built ▁for ▁the ▁Universal ▁Ex position ▁of ▁ 1 8 7 8 . ▁It ▁was ▁a ▁huge ▁iron ▁and ▁glass ▁structure ▁ ▁which ▁contained ▁the ▁industrial ▁displays . ▁It ▁occupied ▁the ▁entire ▁width ▁of ▁the ▁Ex position ▁site , ▁the ▁land ▁ ▁between ▁the ▁a venue ▁de ▁la ▁Bour don na is ▁and ▁the ▁present ▁a venue ▁de ▁Su ff ren , ▁and ▁covered ▁ 7 7 , 0 0 0 ▁square ▁meters , ▁with ▁ 3 4 , 7 0 0 ▁meters ▁of ▁glass ▁windows . ▁ ▁At ▁ 1 1 1 ▁meters , ▁the ▁Galerie ▁covered ▁the ▁longest ▁interior ▁space ▁in ▁the ▁world ▁at ▁the ▁time , ▁It ▁cost ▁ 7 , 4 3 0 , 0 0 0 ▁Fran cs , ▁or ▁seven ▁times ▁the ▁cost ▁of ▁the ▁E iff el ▁Tower . ▁▁▁ ▁It ▁was ▁later ▁used ▁again ▁at ▁the ▁Ex position ▁Univers elle ▁of ▁ 1 9 0 0 ▁and ▁then ▁destroyed ▁in ▁ 1 9 1 0 . ▁▁▁ ▁The ▁Galerie ▁of ▁Mach ines ▁used ▁a ▁system ▁of ▁h ing ed ▁arch es ▁( like ▁a ▁series ▁of ▁bridge ▁sp ans ▁placed ▁not ▁end - to - end ▁but ▁parallel ) ▁made ▁of ▁steel ▁or ▁iron . ▁Although ▁often ▁described ▁as ▁being ▁constructed ▁of ▁steel , ▁it ▁was ▁actually ▁made ▁of ▁iron . ▁ ▁Science ▁and ▁technology ▁One ▁important ▁goal ▁of ▁the ▁Ex position ▁was ▁to