"It will be in a few minutes. Here, take this magnet and put it as far away from the engine room as possible."

It was the work of but a few minutes, now that the disturbing element was removed, to readjust the gravity machine, and Mr. Roumann called:

"Look out, now, everybody! We're going to turn right side up again!"

As he spoke he turned a small valve wheel. There was a clanging of heavy ballast weights, which slid down their rods to the proper places. Then, like some great fish turning over in the water, the Annihilator turned over in the ether, and was once more on her proper keel, if such a shaped craft can be said to have a keel.

Of course, the occupants of the space ship went slipping and sliding back, even as they had fallen ceilingward before, but they were prepared for it, and no one was hurt. From the galley came a chorus of cries, as pots and pans once more scattered about Washington, but there was no more soup to spill.

As soon as the Annihilator was righted, the Cardite motor began to work automatically, and once more the projectile, with the seekers of the moon, was shooting through space at their former speed. They had lost considerable distance, but it was easy to make it up.

"Well, that was an experience," remarked Jack, as he and his chum began picking up the tools and other objects that were scattered all about by the change in equilibrium.

"I should say yes," agreed Mark. "I'm glad it didn't happen at dinner time. That fellow Axtell is a fiend to think of such a thing."

"Indeed, he is! But we're all right now, though it did feel funny to be turned upside down."

An inspection of the projectile was made, but they could discover no particular damage done. She seemed to be moving along the same as before, and, except for the upsetting of things in the store-room, it would hardly have been known, an hour later, that a dreadful accident was narrowly averted.