 She was armed with eight 26 cm ( 10 in ) L / 20 guns mounted in a central battery amidships . As built , the ship was also equipped with a single 21 cm ( 8 @.@ 3 in ) L / 22 gun . After being rebuilt in 1891 – 1895 , her armament was increased by six 8 @.@ 8 cm ( 3 @.@ 5 in ) L / 22 and one 8 @.@ 8 cm L / 30 guns , four and later twelve 3 @.@ 7 cm ( 1 @.@ 5 in ) auto @-@ cannons , and five 35 cm ( 14 in ) torpedo tubes , all mounted in the ship 's hull . Kaiser 's armor was made of wrought iron and backed with teak . The armored belt was 127 to 254 mm ( 5 @.@ 0 to 10 @.@ 0 in ) thick ; this was backed with 90 to 226 mm ( 3 @.@ 5 to 8 @.@ 9 in ) of teak . 
