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The strange cylinder was about sixteen feet long and about eighteen inches in diameter. "Boat o' some kind," he muttered; "but what kind? That screw's too small to make it go. Let's see the other end." He launched it with difficulty, and noticed that when floating end on to the surf it ceased to roll and kept the T-shaped projection uppermost, proving that it was ballasted.
"Dat little shiny screw's 'bout as much as you own." As for the members of the Board, they were radiant. Each one of them, except Brandeth Price, explained some portion of the instruments to some of the bystanders. As for Brandeth, he had not an idea what was to be done with anything. But he had a vote in the Board. He never forgot that.
Taking the relative resistance to be the area of immersed midship section, divided by the square of the screw's diameter, it will in the case of the Rattler be 380/100 or 3.8. From the experiments made by MM. Bourgois and Moll on the screw steamer Pelican, they have deduced the proportions of screws proper for all other classes of vessels, whether the screws are of two, four, or six blades.
The diameter of the screw of the Rattler being 10 feet, the area of its disc is 78.5 square feet; and with the amount of thrust already mentioned as existing in the first experiment, viz. 8722 lbs., the reacting pressure on each square foot of the screw's disc will be 108-1/2 lbs.
"He says 'them," soliloquised the Englishman, "but he means 'her." Claudius found on his table a note from Mr. Screw. This missive was couched in formal terms, and emitted a kind of phosphorescent wrath. Mr. Screw's dignity was seriously offended by the summary ejectment he had suffered at the Doctor's hands on the previous day.
"Do you hear, Pete, who's this?" she cried again, before the lad could answer. "What does he want?" "Says that old iron screw's his, granny." "What, that?" cried the old woman, making a snatch with her thin long-nailed finger at the piece of iron Tom held as far as he could from his adversary.
The weight to be moved, however, is 3.7 cubic feet of water, that being the new water seized by the screw each revolution for every square foot of surface in the screw's disc; and 3.7 cubic feet of water weigh 231.5 lbs., so that the urging force of 214 lbs. is somewhat less than the force of gravity, and the velocity of motion communicated to the water will be somewhat under 1.087 feet per revolution, or we may say it will be in round numbers 1 foot per revolution.
The speed of this vessel, in one of the experiments made with her, was 8.445 knots; the number of revolutions of the screw per minute, 231.32; and the pressure on each square foot of area of the screw's disc, 214 lbs.
He had produced exactly the impression on Mr. Screw's mind which he had intended to produce; and having set that engine of the law in motion, he knew that he could fold his hands and proceed to enjoy himself after his manner.
The diameter of the screw of the Dwarf is 5 feet 8 inches, so that the area of its disc is 25.22 square feet, and the area of immersed midship section is 2.4 times greater than that of the screw's disc. The pressure per square foot of the screw's disc is 214 lbs. in the case of the Minx, and 109-1/2 lbs. in the case of the Dwarf.
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