Why sixteen six-inch guns suited the Diadem role

Sixteen quick-firing six-inch guns gave the Diadems a heavy forward and broadside volume of fire without the crew and handling demands of larger weapons. Six guns could bear forward, fitting a cruiser meant to chase a raider and recalling the concentration of forward fire at the Battle of Lissa. The steam ram discussed alongside that battle is dismissed as a poor weapon. Eighteen longitudinal compartments, protected hoists, and a distributed battery reduced the chance that one hit would silence the ship. Lower casemates could be secured in heavy weather while the upper and end guns remained usable, preserving firepower in the rough seas for which the hull was designed. A nine-man gun crew was economical by the standards of heavier weapons, and sailors could still move six-inch ammunition by muscle power if machinery failed. Standardizing on that calibre combined redundancy, manageable personnel demands, and enough firepower for a protected cruiser's intended opponents.