Jim Cooper, nervous and high-strung as ever, crouched in his seat beside the big weapon as the charge was rammed home and the breech slapped to on the heavy load of Chaosite, which the two Dreadnought Boys beheld for the first time. It was a pinkish, crystalline-looking substance, and its inventor claimed, as safe to handle as ordinary clay, which it resembled in its plasticity. Just to show its properties, before the charge was placed, the inventor picked up a chunk of the explosive and compressed it in his hands. He moulded it into several different shapes, and concluded the exhibition by throwing it on the flooring of the turret with force enough to have detonated a charge of dynamite. "There is only one danger I apprehend from it," he had explained to Lieutenant Timmons, "and that is in the event of a 'flareback.' But under such conditions there is no powder made that is safe." In reply to the officer's questions, the inventor explained that Chaosite was a slow-burning explosive, and if the much-dreaded flareback ever occurred in a gun in which it was being used, blazing particles of the freed explosive would be scattered about the turret. As Chaosite would only explode when confined, these particles would glow like hot coals till they burned out. The deadly peril consisted in the fact that the doors of the ammunition hoist opened directly into the turret. There were safety shutters to the hoist, but in action the reloading followed so fast on the firing of the guns that there was little chance of the safety devices being used. The shaft of the ammunition hoist led directly down to the ammunition table below the water-line on which the explosive was piled, ready to be shot upward on electric elevators. Alongside the ammunition tables were the open doors of the ship's magazine. It does not require vivid imagination to picture what would be the result of blazing particles of a substance like Chaosite dropping down the hoist onto the powder and explosives piled below. Quick and utter annihilation would follow. Not a soul of the eight hundred odd crew and forty officers would stand any but the smallest chance of salvation. The Dreadnought Boys, as well as the rest of the crew in the turret, were interested listeners to the conversation. All of them knew what a flareback was. One had occurred on the _Georgia_ a year before, costing two lives. It is usually caused by fragments of burning powder being left in the chamber of the gun after a charge has been fired. An electric blower is attached to the big guns of Uncle Sam's navy, which is supposed to thoroughly clean the chamber after each discharge; but it is not careless sailor-proof, and occasionally the newspapers bear dreadful testimony to the result of a flareback, which occurs when the new load is ignited by the left-over fragments of the old one. But the talk between Mr. Varian and the officer was suddenly checked. "Boom!"