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Updated: May 14, 2025
The internal combustion engine was then an unknown quantity, and he had to turn to steam, finally, as the propulsive energy for his power plant. The chief problem which faced him was that of the relative weight and power of his engine; he harked back to the Stringfellow engine of 1868, which in 1889 came into the possession of the Smithsonian Institution as a historical curiosity.
When the little harbor at the mouth of Sir John's Run was still more wild and lonely than now, James Rumsey, a working bath-tender at Berkeley Springs, launched upon it a boat that he had invented of novel principle and propulsive force. The force was steam, and Rumsey had shown his model to Washington in 1780.
The fact is, that beyond a certain point any increase of the initial velocity of the ball is unfavorable both to range and precision, owing to the ascertained law that the ratio of increase of atmospheric resistance is four times that of the velocity, so that, after the point is reached at which they balance each other, any additional propulsive power is injurious.
Just how the air took on this propulsive property was not explained, and the vagueness of thought that characterized the time did not demand an explanation. Possibly the dying away of ripples in water may have furnished, by analogy, an explanation of the gradual dying out of the impulse which propels the stone. All of this was, of course, an unfortunate maladjustment of the point of view.
Finally, in interstellar space, Seaton threw out super-powered detector and repelling screens, anchored himself at the driving console with a force, set the power control at "molecular" so that the propulsive force affected alike every molecule of the vessel and its contents, and, all sense of weight and acceleration lost, he threw in the plunger switch which released every iota of the theoretically possible power of the driving mass of uranium.
The mechanical "triumph," rudely made of a cheap metal composition, is a duplicate of a toy long used by boys to the delight of each other, and to the annoyance of their elders. The propulsive power resides in a steel spring, which has force enough to send a bird-shot across a good- sized room. The outfit would cost perhaps six or eight cents to the manufacturer.
In no cases were the repairs to the propulsive machinery delayed beyond the time necessary to equip these ships as transports. Electric and acetylene welding is not a complicated art in the hands of skilled men; for patching a hole, or filling the cavity of a great crack in a cylinder, say by electric welding, may be compared to a similar operation in dental surgery.
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.
So great was the energy of the fire, so terrible its propulsive force, that the colossal structure was in some sort raised bodily from the earth, trembling and rumbling on its foundations, preserving intact only its four massive walls, in the fierce eruption that hurled its heavy zinc roof high in air.
In 1768 Paucton conceived the idea of an apparatus with two screws, suspensive and propulsive. In 1781 Meerwein, the architect of the Prince of Baden, built an orthopteric machine, and protested against the tendency of the aerostats which had just been invented. In 1784 Launoy and Bienvenu had maneuvered a helicopter worked by springs.
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