As the control-levers flashed down under my hands our ship dived down through space with the swiftness of thought. The next instant there came a jarring shock, and our craft spun over like a whirling top. Everything in the conning-tower, windows and dials and controls, seemed to be revolving about me with lightning speed, while I clung dizzily to the levers in my hands. In a moment I managed to swing them back into position, and at once the ship righted herself and sped smoothly on through the e