▁arm ored ▁cru is ers . ▁The ▁first ▁two ▁ships ▁( ▁and ▁Jules ▁Fer ry ) ▁measured ▁ ▁overall , ▁with ▁a ▁beam ▁of ▁ ▁and ▁a ▁draft ▁of ▁. ▁All ▁three ▁sister ▁ships ▁were ▁designed ▁to ▁dis place ▁ ▁at ▁normal ▁load . ▁Their ▁crew ▁normally ▁number ed ▁ 2 6 ▁officers ▁and ▁ 7 0 8 ▁en list ed ▁men , ▁or ▁ 3 0 ▁officers ▁and ▁ 7 4 9 ▁men ▁when ▁serving ▁as ▁a ▁flags hip . ▁ ▁The ▁ships ▁had ▁three ▁vertical ▁triple - exp ansion ▁steam ▁engines , ▁each ▁driving ▁one ▁prop eller ▁sh aft . ▁Each ▁of ▁the ▁sister s ▁used ▁a ▁different ▁model ▁of ▁water - t ube ▁bo iler ▁and ▁Jules ▁Fer ry ▁was ▁fitted ▁with ▁ 2 0 ▁Guy ot - du ▁Temple ▁bo ilers . ▁Their ▁engines ▁were ▁r ated ▁at ▁a ▁total ▁of ▁ ▁to ▁reach ▁their ▁designed ▁speed ▁of ▁. ▁During ▁her ▁sea ▁tri als ▁on ▁ 7 ▁December ▁ 1 9 0 6 , ▁Jules ▁Fer ry ▁reached ▁ ▁from ▁. ▁The ▁cru is ers ▁carried ▁enough ▁coal ▁to ▁give ▁them ▁a ▁range ▁of ▁ ▁at ▁a ▁speed ▁of ▁. ▁ ▁The ▁main ▁battery ▁of ▁the ▁Lé on ▁G amb etta ▁class ▁consisted ▁of ▁four ▁ 1 9 4 - mill imeter ▁Mod èle ▁ 1 8 9 3 – 1 8 9 6 ▁guns ▁mounted ▁in ▁tw in - gun ▁tur rets ▁fore ▁and ▁a ft ▁of ▁the ▁super structure . ▁Their ▁secondary ▁arm ament ▁compr ised ▁six