Sydney Marow Eardley-Wilmot,
The Development of Navies During the Last Half-Century
(1892)
“ For it was about this time that a change came over the design of machinery for the propulsion of war vessels, so complete and radical as to mark a distinct epoch in its history. When once the fact had been grasped that all men-of-war for the future would be propelled by the screw, the immense advantage realised by the low position of the main shaft, far below the water line, became apparent, as the engines, being horizontal, would be in a great measure protected from the enemy’s fire, instead of being, as in paddle-wheel ships, dangerously and unavoidably exposed to it. ”

