"I wouldn't go so far as that," the other answered. "There'd be a lot more wrecks than there are if it weren't for the storm signals of the Weather Bureau. They can always warn ships of the coming of a big storm, one of these West Indian hurricanes, for instance. Squalls, of course, they can't foresee. Usually, that doesn't matter, because no seaworthy vessel is going to be worried by a squall. But that iron cylinder wasn't seaworthy. At least, you should have heard what the men called it who had been on board the night it nearly went down!"

"I can imagine," said Eric.

"Then you've a healthy imagination," his friend replied grimly. "As I was saying," he continued, "the fleet started out under sunny skies and a smooth sea. They reached the place where the buoy was moored and Father took very careful observations to make sure that the buoy had not shifted during the storm. Everything was all right, and the instant the cylinder was immediately over the precise spot, the valves were opened and the water began to pour in.

"The tugs at once brought up the two barges containing heavy blocks of stone, and the instant that the cylinder touched the bottom, the gangs of men started to heave the stones overboard."

"What in the wide world was that for?"

"To prevent the water from scouring away the sand. You see it's all sand there, that's why the caisson was made. As soon as the current would strike an obstruction like the cylinder, it would make a gyratory sweep around its base. With the strong tides of Chesapeake Bay, even an hour would be enough to scoop out the sand and plunge the whole structure edgewise into the sea. So overboard the stones went, all round the cylinder, making a rough protecting wall against the undermining force of the water. The swirl, instead of striking the smooth iron side of the cylinder, would be broken against the pile of rocks. Moreover, with the sand thus protected it could not be washed away so easily by the force of the current.

"At the same time, another gang of men was sent aboard the cylinder, and one of the smaller tugs brought up a barge loaded with concrete. The men tumbled into the compartments of the cylinder. From the barge two pipes were thrust. Down one of these poured a steady stream of cement, from the other a torrent of small grit, while an unceasing cataract of salt water rushed down from the pumps of the steamer.

"In this awful mess of cement, water, and small stones the men wallowed and struggled, mixing the concrete and packing it down hard into place. Wet to the skin, covered with cement dust, it was all that they could do to keep from turning into concrete statues, and the foreman was continually advising the men to put hands and faces directly under the stream of water and not to give the cement dust a chance to harden on their faces. For two hours they slaved, working in a frenzy of haste.

"Then, when everything was proceeding so well and so rapidly, a black storm-cloud came up out of the sea to the southeast, and the waves began to roll in. The whistle for recall blew shrilly. Up from the cylinder poured the shovelers, covered with concrete and looking like gray images of men. There was a wild flight for the steamer. One of the barges snapped a hawser and it was only by the herculean efforts of the smaller tug that she was kept from collision with the cylinder. Had that tug, loaded down with building material, ever canted against the cylinder, the whole effort would have been in vain.

"One of the lifeboats, containing sixteen men, was picked up by a wave and thrown against the iron rim as a child throws a ball. The boat went into matchwood and every one of the sixteen men was thrown into the water. But Father had taken the precaution of not engaging any man who was not a good swimmer, and the other tug had received instructions to follow each boatload of workmen every trip they took. Accordingly, when the men were thrown into the sea, the tug was not twenty yards away and every one was picked up without injury.