At the request of Hiero, king of Syracuse, Archimedes had in past years constructed a great number of machines for casting stones and darts; with which the walls were so well supplied, that the Romans were defeated in every attempt to approach: Marcellus ran his ships by night beneath the walls, hoping to be within the range of these destructive engines. Here, however, he was anticipated, for Archimedes had hollowed chambers in the walls themselves, with narrow openings, like the embrasures of a Gothic castle, from which archery, and the smaller sorts of missile engines, were directed against the Roman ships with destructive effect. Against the sambucæ he had contrived machines, from which long beams or yards projected, when in use, far beyond the walls. These were heavily weighted with stone or metal to the extent of not less than ten talents, or 1250 pounds. A rapid circular motion being then given to the beam by machinery within the walls, this weighted lever was dashed against the ladder with such force as generally to break it, while the ship itself was exposed to considerable danger. This story not being good enough for Plutarch, he has told us, that when the sambuca was a good way off the walls, a stone ten talents weight was thrown into it, and then a second, and third, which destroyed the vessel; and in consequence considerable ridicule has been thrown on the tale. As told by Polybius it seems little open to objection. Weights, not of half a ton, but several tons, are constantly to be seen on our wharfs suspended on cranes, at a considerable distance from a centre of motion. Add to one of these the machinery requisite to give a rapid circular motion to the projecting arm thus laden, and we have the engine of Archimedes, as described by Polybius. The geometrician had also fitted out powerful cranes, with hooks and chains, by which he could lift a ship almost out of the water. When it was raised to the greatest practicable height, the chain was slipped, and the vessel usually was either upset by the fall, or plunged so deep as to fill with water. Marcellus is reported to have observed (it must have been a forced joke), that Archimedes used his ships for cups to draw water in. Finally he was obliged to abandon the attack by sea. Appius Claudius, who conducted the siege by land, fared no better: and it was resolved at last to give up all hopes of succeeding by force, and trust to the slow operation of blockade. “Thus,” says Polybius, “one man, and one art rightly prepared,[16] is for some matters a mighty and a wonderful thing; for the Romans, having such power by land and sea, take away but one old man of Syracuse, might have expected immediately to capture the city; but while Archimedes was there, they dared not even to attack it in that manner against which he was capable of defending it.”