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In intent we pass over from existence to ideality, the nexus lying in the propulsive nature of life which could not have been capped by any form of knowledge which was not itself in some way transitive and ambitious. Intent, though it looks away from existence and the actual, is the most natural and pervasive of things.
The sail-boat was an advance on the rude dugout propelled by paddles. The first clumsy steamboat seemed a marvel to those who had known no other propulsive power than that of the wind or the oar.
The ancient philosophers puzzled more than a little over this problem, and the Aristotelians reached the conclusion that the motion of the hand had imparted a propulsive motion to the air, and that this propulsive motion was transmitted to the stone, pushing it on.
This membrane is ciliated, that is, it is studded with tiny hairlike projections, extending into the air passages. These are constantly in motion, much like the grain in a field when the wind is gently blowing. Their function is to prevent the entry of foreign particles into the air cells, for their propulsive motion is away from the lungs, toward the external air passages.
One of the first constituents of a good style is what Coleridge calls "progressive transition," which implies a dynamic force, a propulsive movement, behind the pen.
At the same time the electric engines are put into motion and the propulsive force of the propellers acts upon the diving rudders and causes the sinking to become a gliding.
According to the current idea, a projectile fired, for example, from a cannon, moved in a straight horizontal line until the propulsive force was exhausted, and then fell to the ground in a perpendicular line. Galileo taught that the projectile begins to fall at once on leaving the mouth of the cannon and traverses a parabolic course.
Guyton de Morveau, entrusted by the Academy of Dijon with the building of a sailing balloon, first used a vertical rudder at the rear end of his construction it survives in the modern dirigible. His construction included sails and oars, but, lacking steam or other than human propulsive power, the airship was a failure equally with Guyot's.
A four-foot shell of metal five hundred times as strong and hard as the strongest and hardest steel, cast in one piece with the sustaining framework designed by the world's foremost engineer a structure that no conceivable force could deform or injure, housing an inconceivable propulsive force!
The vital need seems to be a single propulsive agency for progress on the surface and when submerged. Fifteen cargo ships with a deadweight tonnage of 103,692, were lost during 1918 by the Naval Overseas Transportation Service.
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