They had not yet shown me the engines of the nameless ship, and I welcomed the opportunity, grown weary with watching the dull green of the sea, and the monotony of the sky-laden clouds. Dick led the way quickly from the gallery to the lower deck, and thence down an iron ladder to the great engine-room. Here truly was a wondrous sight; the sight of three sets of the most powerful engines that have yet been placed in a battle-ship. Each of them had four cylinders, eighty inches in diameter; and all were driven by the hydrogen from the huge gasometers which our holds formed. The gas itself was made by passing the steam from a comparatively small boiler through a coke and anthracite furnace, the coke combining with the oxygen and leaving pure hydrogen. The huge cylinders drove upwards with a double crank to carry their motion to the screw; and I found that the difficulty of starting and reversing was overcome by an intermediate bevel-wheel gearing and friction clutch, which could throw the motion off the shaft, and allow that instantaneous going astern otherwise impossible in a gas-engine. That day there was a huge fire in the furnace, emitting terrific heat and crackling sparks, for the men were making gas, in view of a run or two off the coast of Ireland. It was more pleasant than I can tell you to watch the entire absorption of the gifted engineer, in the maze of machinery
