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Updated: June 25, 2025
Rip smashed at the escape hatch above his head, grabbed propulsion tubes from the rack and called, "Now!" He pulled the release on his harness, stood up on the seat, and thrust with all his leg power. He catapulted out of the burning snapper-boat into space. Santos followed a second later and the crippled rocket twisted wildly under the two Planeteers.
The first will be answered in a few days' time, no doubt, in view of the rapidity with which we are ripping through the water, under the action of a means of propulsion that I shall end by finding out all about. As regards the second, I am by no means so sure that my curiosity will ever be gratified.
Ericsson's contributions to the art of naval warfare are embodied in the "Princeton," the "Monitor" and its class, and the "Destroyer." In the "Princeton" the material used was wood, and in the "Monitor" and "Destroyer" iron, following simply the developments of the age. In the three the means of propulsion was by screw-propeller.
In the first of these two engines, which was designed for airship propulsion, the weight had been about 8 lbs. per brake horse-power, no special attempt appearing to have been made to fine down for extreme lightness; in this 60 horse-power design, the weight was reduced to 6.1 lbs. per horse-power, counting the latter as normally rated; the engine actually gave a maximum of 75 brake horse-power, reducing the ratio of weight to power very considerably below the figure given.
Simpson paused and said he had altered his mind, and twice did the propulsion of Mr. Mills's right hand, and his flattering argument, make him alter it again. It was a matter of relief to Mr. Simpson that the barber took his instructions without any show of surprise.
Propulsion of this airship was to be accomplished by means of sails, and also by oars. Lana antedated the modern propeller, and realised that the air would offer enough resistance to oars or paddle to impart motion to any vessel floating in it and propelled by these means, although he did not realise the amount of pressure on the air which would be necessary to accomplish propulsion.
Preferably the water is here divided into two streams, each driving a separate rotary motor or turbine, H, themselves driving twin screws or propellers, I. The motors exhaust into the hollow shafts, J, of the propellers, which are extended some distance beyond the propellers, so that the remaining energy of the water may be utilized to aid in propelling the torpedo on the well known principle of jet propulsion.
"Some careful experiments on the decomposing power at various distances were made from which the law of propulsion has been deduced, verifying the results of Ohm and those which I made in the summer of 1842, and alluded to in my letter to the Honorable C.G. Ferris, published in the House Report, No. 17, of the last Congress.
It was always the same story beginning afresh: an apparition; a persecuted shepherdess, who was called a liar; next the covert propulsion of human misery hungering after illusion; then propaganda, and the triumph of the sanctuary shining like a star; and afterwards decline, and oblivion, when the ecstatic dream of another visionary gave birth to another sanctuary elsewhere.
The revolution in the propulsion and construction of ships, for instance, has not found them prepared to take the advantage they have usually done of improvements.
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