In addition to these necessary appointments there was hung over one shoulder a canvas haversack, containing a small cord, a chisel, a water-compass, and a sheath-knife. The sheath-knife is the last desperate resource of the diver when his air-hose becomes tangled or clogged, his signals are misunderstood, and he must either cut his hose in the effort to free himself and reach the surface, or suffocate where he is. Captain Joe adjusted the copper helmet, and stood with Caleb’s glass face-plate in his hand, thus leaving his helmet open for a final order in his ear, before he lowered him overboard. The cogs of the Screamer’s drum began turning, followed by the same creaking and snapping of manilla and straining of boom that had been heard when she was loaded. Meanwhile between the sea and the sloop a fight had already begun. The current which swept by within ten feet of her bilge curled and eddied about the buoy-floats, tugging at their chains, while wave after wave tried to reach her bow, only to fall back beaten and snapping like hungry wolves. The Cape Ann sloop had fought these fights before: all along her timber rail were the scars of similar battles. She had only to keep her bow-cheeks from the teeth of these murderous rocks, and she could laugh all day at their open jaws. With the starting of the hoisting-engine the steam began to hiss through the safety-valve, and the bow-lines of the sloop straightened like strands of steel. Then there came a slight, staggering movement as she adjusted herself to the shifting weight. Without a sound, the stone rose from the deck, cleared the rail, and hung over the sea. Another cheer went up—this time from both the men on board the sloop and those on the Ledge. Captain Brandt smiled with closed lips. Life was easy for him now. “Lower away,” said Captain Joe in the same tone he would have used in asking for the butter, as he turned to screw on Caleb’s face-plate, shutting out the fresh air, and giving the diver only pumped air to breathe. The stone sank slowly into the sea, the dust and dirt of its long outdoor storage discoloring the clear water. “Hold her,” continued Captain Joe, his hand still on Caleb’s face-plate, as he stood erect on the ladder. “Stand by, Billy. Go on with that pump, men,—give him plenty of air.” Two men began turning the handles of the pump. Caleb’s dress filled out like a balloon; Lacey took his place near the small ladder, the other end of Caleb’s life-line having been made fast to his wrist, and the diver sank slowly out of sight, his hammer in his hand, the air bubbles from his exhaust-valve marking his downward course. As Caleb sank, he hugged his arms close to his body, pressed his knees together, forcing the surplus air from his dress, and dropped rapidly toward the bottom. The thick lead soles of his shoes kept his feet down and his head up, and the breast-plates steadied him.