9 6 ▁gun ▁was ▁a ▁typical ▁built - up ▁French ▁heavy ▁gun ▁of ▁its ▁period . ▁It ▁used ▁a ▁Wel in ▁interrupted - s cre w ▁b ree ch ▁and ▁bag ged ▁prop ell ant ▁with ▁a ▁de ▁B ange ▁obt ur ator ▁to ▁get ▁a ▁good ▁gas ▁se al ▁during ▁firing . ▁It ▁was ▁mounted ▁in ▁tw in - gun ▁tur rets ▁which ▁had ▁a ▁couple ▁of ▁unusual ▁features . ▁First , ▁most ▁of ▁the ▁tur ret ' s ▁operating ▁mach in ery ▁was ▁hous ed ▁inside ▁the ▁tur ret , ▁with ▁only ▁an ▁arm ored ▁t ube ▁to ▁protect ▁the ▁am mun ition ▁ho ists . ▁This ▁made ▁little ▁difference ▁in ▁the ▁overall ▁weight ▁of ▁the ▁tur ret , ▁but ▁did ▁raise ▁the ▁mach in ery ▁higher ▁in ▁the ▁ship ▁than ▁the ▁tur rets ▁of ▁other ▁nations , ▁which ▁did ▁have ▁imp lications ▁for ▁stability . ▁Second ly , ▁they ▁used ▁a ▁hyd ra ul ic ▁pivot ▁to ▁lift ▁the ▁tur ret ▁when ▁it ▁rot ated ; ▁this ▁was ▁lower ed ▁onto ▁a ▁se ating ▁ring ▁when ▁the ▁tur ret ▁was ▁in ▁the ▁proper ▁position ▁to ▁fire . ▁Each ▁tur ret ▁had ▁a ▁nom inal ▁ 3 0 0 ° ▁of ▁traverse , ▁although ▁each ▁ship ▁had ▁its ▁own ▁specific ▁limitations . ▁ ▁Rel ated ▁G uns ▁The ▁ 1 2 - inch / 4 0 ▁cal ib re ▁Can on ▁de ▁ 3 0 5 mm / 4 0 ▁Mod èle ▁ 1 8 9 3 ▁gun ▁was ▁an ▁earlier