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Updated: June 14, 2025
Our rocket cars were only perfected in the usual slow course of invention, and could neither have been constructed nor propelled a hundred years ago, for neither was the metal of which they are constructed produced, nor had the method of propulsion or even the propulsive power been developed.
All those masses of water which receive a horizontal acceleration from the keel run counter, on the contrary, to the propulsive stress, and it becomes of interest, therefore, to bring them to a minimum. The vertical stress is limited by the weight of the boat, and, theoretically, with an infinite degree of speed, the boat would graze the water without being able to enter it. Pictet to.
"Put on your propulsive space-suit. Hurry. Then here." "Right!" Carse ran over to where he had left his suit and rapidly got inside. As he did so, he said: "Eliot, there's fast work to be done while I'm gone with Ban. You must take your assistants and Dr. Ku up to the asteroid in the air-car and transfer down here all the equipment Dr. Ku says he'll need.
As we may eradicate a desire so may we create a desire. How, then, may one who seeks the highest self-development use desire, this propulsive force of nature, to help himself forward? He should desire spiritual progress most earnestly, for without such desire he cannot succeed. Therefore if the aspirant does not have the ardent desire for spiritual illumination he must create it.
His goal is in a sense beyond him, since it is not his experience, but a form which all experience ought to receive. The inmost texture of his being is propulsive, and there is nothing more intimately bound up with his success than mobility and devotion to transcendent aims.
Emerging, by the propulsive method, from college, in the first term of his freshman year, he had taken a post-graduate course in the cigarette ward of a polite retreat for nervous wrecks.
But how is this remarkable propulsive machine made to perform its functions? If I were suddenly to kill one of these animals and to take out all the soft parts, I should find the shell to be perfectly inert, to have no more power of moving itself than is possessed by the machinery of a mill, when disconnected from its steam-engine or water-wheel.
Germany long ago claimed to have perfected woodpulp as a substitute for cotton in propulsive ammunition. She made this claim very early, however, for the purpose of hoodwinking British blockade advocates. Her great need eventually led her to take steps to induce the United States to insist on the Entente Powers raising the blockade on cotton.
Thus are we tricked and apparently mocked by nature until we finally awake to the fact that all the objects of desire the fine raiment, the jewels, the palaces, the wealth, the power, are but vain and empty things; and that the real reward for all our efforts to secure them is not these objects at all but the new powers we have evolved in getting them; powers that we did not before possess and which we should not have evolved but for nature's great propulsive force desire.
As early as the Seventeenth Century the possibility of developing a propulsive thrust by the use of a submerged helicoidal, or screw, propeller, had been vaguely recognized, and during the following, or Eighteenth Century, the same idea had been brought forward. It had been viewed in this connection, however, merely as a curiosity, and led to no immediate results.
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