sentences:  Neither ship's armament was of a standard Royal Navy type—they had been designed to meet the requirements of the Chilean Navy and each ship was armed by its respective builder, although performance was identical.They were the first British battleships since the "Renown" to mount a main battery of 10-inch (254 mm) guns and the last to do so.The ships mounted slightly different types of 45-calibre 10-inch guns, each ship using guns designed by its builder.