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Updated: July 20, 2025
In view of the fact that such bomb-dropping is exceedingly inaccurate, and that the charges carried are relatively small, this form of attack ordinarily would not be very dangerous for the submersible. Surface craft have also employed large charges of high explosives, which are caused to detonate by hydrostatic pistons upon reaching a certain depth.
Having executed a flank movement, the Dewey now was endeavoring to engineer a surprise attack on the German submarine from the rear. To all intents, the German commander had not yet noted the approaching American submersible. He was going after the transports full tilt, hoping to bore through the destroyers' smoke curtain and torpedo one of the Yankee fleet.
The moment he saw that the king was safely aboard the Ark, De Beauxchamps, with a farewell salutation, disappeared into the interior of the Jules Verne, and the submersible sank out of sight as gently as if it had been a huge fish that had come to the top of the sea to take a look about.
A submersible of a thousand tons displacement will carry about five hundred tons of water ballast. The problem of submerging is mainly that of being able rapidly to fill the tanks. On account of the necessity of dealing with large quantities of water in the ballast system, the European submersibles are equipped with pumps which can handle eight tons of water per minute.
At the same time two boys well to the stern waved their arms frantically toward the group on the conning tower of the Dewey. "Here I am, Jack, and Bill Witt is right with me," came the familiar voice of Ted Wainwright. "Hurrah!" the cry arose from the deck of the American submersible.
The fact that the submersible is propelled under water by powerful electric motors begets the idea that the electrical disturbances therein might be detected by highly sensitive detectors of feeble electrical oscillations. The sea-water, in this case, will be found to absorb to a tremendous extent the effects of the electrical disturbance.
Whether the German U-boat campaign succeeds or not will be largely a question of the number of submersibles that the Central Powers can put into service, and to what extent the submersible will be developed during the present war. German submarines have sunk over 7,250,000 tons of the Allied shipping.
While endeavoring to devise intricate and ingenious mechanisms to sink the submersible, we overlook the simplest safeguards for our merchant vessels. To-day, the construction of the average ship is designed to conform to the insurance requirements. This does not mean in any way that the ship is so constructed as to be truly safe.
Of all those aboard, he was the one who could least appreciate the effects of the shots for he could scarcely discern the silhouette of the submersible. But in spite of that he continued bellowing with all the force of his faith. "Now you've hit it!... Hurrah! Hurrah!" And the strange thing was that the enemy instantly disappeared from the blue surface.
As he swam he thought of the boys back there in Uncle Sam's submersible and how they, too, would be negotiating this same swim very shortly -provided they escaped as safely as he had. Before his mind flashed also the picture of what might happen to him when at last his feet would strike bottom and he would make his way through the surf to shore.
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