When the fuel shot through the tubes, it exerted force on the gas cloud that was far above the actual speed of the explosion. The heat of combustion was reduced, and the ship operated without effect from the blasts. The tubes were small, yet the power expended was beyond anything ever accomplished on earth.--Author. Transcriber's Note: This etext was produced from _Amazing Stories_ April 1956 and was first published in _Amazing Stories_ February 1939. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and typographical errors have been corrected without note. End of Project Gutenberg's Wanted--7 Fearless Engineers!, by Warner Van Lorne