▁guns ▁in ▁the ▁central ▁battery ▁on ▁the ▁battery ▁deck . ▁The ▁other ▁two ▁ 1 9 4   mm ▁guns ▁were ▁mounted ▁in ▁bar b ettes ▁on ▁the ▁upper ▁deck , ▁spons oned ▁out ▁over ▁the ▁sides ▁of ▁the ▁ship . ▁The ▁four ▁ ▁guns ▁were ▁also ▁mounted ▁on ▁the ▁upper ▁deck . ▁She ▁later ▁ex changed ▁her ▁ 1 9 4   mm ▁guns ▁for ▁newer ▁Mod èle ▁ 1 8 7 0 ▁guns . ▁ ▁The ▁arm or - p ier cing ▁shell ▁of ▁the ▁ 2 0 - cal iber ▁M le ▁ 1 8 7 0 ▁gun ▁we ighed ▁ ▁while ▁the ▁gun ▁itself ▁we ighed ▁. ▁The ▁gun ▁fired ▁its ▁shell ▁at ▁a ▁m uzz le ▁velocity ▁of ▁ ▁and ▁was ▁cred ited ▁with ▁the ▁ability ▁to ▁pen et rate ▁a ▁nom inal ▁ ▁of ▁wr ought ▁iron ▁arm our ▁at ▁the ▁m uzz le . ▁The ▁guns ▁could ▁fire ▁both ▁solid ▁shot ▁and ▁explos ive ▁shell s . ▁ ▁Arm or ▁Al ma ▁had ▁a ▁complete ▁ ▁wr ought ▁iron ▁water line ▁bel t , ▁approximately ▁ ▁high . ▁The ▁sides ▁of ▁the ▁battery ▁itself ▁were ▁arm ored ▁with ▁ ▁of ▁wr ought ▁iron ▁and ▁the ▁ends ▁of ▁the ▁battery ▁were ▁closed ▁by ▁bulk head s ▁of ▁the ▁same ▁thick ness . ▁The ▁bar b ette ▁arm or ▁was ▁ ▁thick , ▁back ed ▁by ▁ ▁of ▁wood . ▁The ▁un arm ored ▁port ions ▁of ▁her ▁sides ▁were ▁protected ▁by ▁ ▁iron ▁pl ates . ▁