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Updated: April 30, 2025
The boys resumed their studies at school, and Professor Henderson devoted much of his time to writing a book describing some of the peculiar conditions on Mars, while Mr. Roumann invented a new motor to run with Cardite, he having revealed the secret of the Etherium one to Professor Henderson.
In this book is told how the projectile, Annihilator, was built and, the projectile being driven by the Etherium motor, the party was transported to the planet Mars. Later, because of some knowledge obtained from a Martian newspaper by Jack, they all made a trip to the moon in search of a field of diamonds, and their adventures as related in "Lost on the Moon" were of the most thrilling kind.
"How soon before we will be ready to start?" asked Jack one day, while he and his chum, with the two professors, were working over the projectile, which was soon to be shot through space. "In about two weeks," replied Mr. Roumann. "I want to make a few changes in the Cardite plates, which will replace the ones used on the Etherium motor.
"The special tools came to-day, and the motor has been repaired. We have tested it, and the Cardite power works even better than did the Etherium apparatus." "Then we can start as soon as Mark is found?" asked Andy Sudds. "Yes, for everything has been put inside the projectile, and all that remains is to haul it out of the shed, point it at the moon, and start the motor."
I am having a little more trouble with my Etherium motor than I anticipated." "I don't exactly understand how that works," said Jack. "The plans don't call for any opening the stern of the Annihilator for a propeller to project from, and there is no provision for a tube, such as we used to send compressed air from the Flying Mermaid. Nor is there anything in front to pull the Annihilator along."
"Now we will begin to travel through ether." He adjusted some levers, turned two wheels, threw over electric switches, and there came a perceptible jar to the projectile. "What was that?" asked Jack. "I have disconnected the atmospheric motor," explained the German, "and the Etherium one is now working. We are shooting along through ether at the rate of one hundred miles a second."
Roumann went to an opening in the side that led to the engine-room. No sooner had he entered than he uttered a cry. "The Etherium motor is damaged!" he exclaimed, and with fear in their hearts the others followed him inside the Annihilator.
"The atmospheric motor is not working as fast as I hoped it would, but we are going fast enough. When we start the Etherium machine we shall go much more speedily." "And when will that be?" asked Mark. "I can't tell exactly. It will not be until we have passed through the atmosphere of the earth, and there is no way of ascertaining in advance just how thick that stratum is."
"And is that different from our atmosphere?" asked Mark. "Much different," replied Mr. Roumann. "There is no air to it at all. The secret power which I have invented is perfectly adapted to project us through this ether. That is why I call it Etherium.
He pressed a lever, turned a wheel, and then exclaimed: "The Etherium motor has stopped working 'again! I wonder if the maniac is loose!" "We'll see!" cried Jack, as he and Mark hurried toward the engine-room. They found Mr. Roumann there. "The motor has stopped!" exclaimed Jack. "I know it." "Has there been an accident?" "No." "What's the matter, then?"
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