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These are necessary in order that two deals may be operated upon simultaneously, each division being devoted to a separate deal, and likewise to enable the connecting-rod which works the frame to pass up the center and oscillate on a pin near the top, thereby avoiding the deep excavations and costly foundations required where the rod is engaged with the pin at the bottom.
It came down again, the full weight of the steam behind it, and the foot of the disconnected connecting-rod, useless as the leg of a man with a sprained ankle, flung out to the right and struck the starboard, or right-hand, cast-iron supporting-column of the forward engine, cracking it clean through about six inches above the base, and wedging the upper portion outwards three inches towards the ship's side.
It came down again, the full weight of the steam behind it, and the foot of the disconnected connecting-rod, useless as the leg of a man with a sprained ankle, flung out to the right and struck the starboard, or right-hand, cast-iron supporting-column of the forward engine, cracking it clean through about six inches above the base, and wedging the upper portion outwards three inches towards the ship's side.
The noise was released, the little locomotive with her clanking steel connecting-rod emerged on the highroad, clanking sharply. The mare rebounded like a drop of water from hot iron. Ursula and Gudrun pressed back into the hedge, in fear. But Gerald was heavy on the mare, and forced her back. It seemed as if he sank into her magnetically, and could thrust her back against herself.
They had kept the hardest work to the last, as boys save Latin prose, and, worn though they were, Mr. Wardrop did not dare to give them rest. The piston-rod and connecting-rod were to be straightened, and this was a job for a regular dockyard with every appliance. They fell to it, cheered by a little chalk showing of work done and time consumed which Mr.
In conclusion, he disconnected the after-engine, laid piston and connecting-rod, carefully tallowed, where it would be most inconvenient to the casual visitor, took out three of the eight collars of the thrust-block, hid them where only he could find them again, filled the boilers by hand, wedged the sliding doors of the coal-bunkers, and rested from his labours.
The others stayed aboard and replaced piston, piston-rod, cylinder-cover, cross-head, and bolts, with the aid of the faithful donkey-engine. The cylinder-cover was hardly steam-proof, and the eye of science might have seen in the connecting-rod a flexure something like that of a Christmas-tree candle which has melted and been straightened by hand over a stove, but, as Mr.
Wardrop's voice rose and fell echoing, till the quick tropic night closed down over the engine-room skylight. Next morning the work of reconstruction began. It has been explained that the foot of the connecting-rod was forced against the foot of the starboard supporting-column, which it had cracked through and driven outward towards the ship's skin.
There the connecting-rod jammed. Meantime, the after-engine, being as yet unembarrassed, went on with its work, and in so doing brought round at its next revolution the crank of the forward engine, which smote the already jammed connecting-rod, bending it and therewith the piston-rod cross-head the big cross-piece that slides up and down so smoothly.
The oil is pumped through a single manifold, with seven branches to the crankshaft main bearings, and then in turn through the hollow crankshaft to the connecting-rod big ends and thence through small tubes, already noted, to the small end bearings. The oil pump has four pistons and two double valves driven from a single eccentric shaft on which are mounted four eccentrics.
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