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Instead of the rubbing surface of a piston, however, a conical valve face between the cylinder and piston is employed, which is tight only when the cylinder is in its lowest position; and there is a similar face between, the edge of the cylinder and the bottom of the box in which it is placed.
Phillip was very much done up, and greatly dissatisfied with the result of his exertions; but he soon began to make the best of things, as he always did. "I'm a selfish duffer, Minnie," said he. "All the good I've done by frightening you like this is to get myself splendidly warm." "What, have you done nothing to the valve?" "Didn't have time.
"Do you not think that matters have gone far enough, and that these poor devils should not be excited beyond measure?" "No, no!" cried the doctor; "no! I will go on to the end!" "As you will, master; the experiment, however, seems to me conclusive, and I think it time to " "To " "To close the valve." "You'd better!" cried Doctor Ox. "If you attempt it, I'll throttle you!"
From the right ventricle a large vessel called the pulmonary artery passes to the lungs, and from the left ventricle a large vessel called the aorta arches out to the general circulation of the body. The openings from the ventricles into these vessels are guarded by the semilunar valves. Each valve has three folds, each half-moon-shaped, hence the name semilunar.
At this moment, up came the engineer to report that the engine had suddenly become entirely useless from the giving way of some of the valve castings, and that twenty-four hours, at least, would be required before the damage could be repaired.
The Connie wrenched violently and threw them both upward. Rip felt the star shape and twisted. If he could only deflate the Connie's suit! But the man was writhing from his grip, clawing for a weapon. Then Rip stopped reaching for the deflation valve. He grabbed his knife, jerked it free, and thrust it against the middle of the Connie's back.
I'm in dead earnest, you know. Of course, being all shot to pieces physically, I can't go to the front, where I'd give my neck to be. Why, with this leaky heart valve of mine I couldn't even " "Yes, yes," I broke in. "We've been over all that. Not that I'd mind hearing it again, but just now I'm more or less busy." "Are you, though?" says Barry. "Isn't that perfectly ripping!
Rick waited until last, and called, "Everybody getting air?" When they nodded, he put his own mouthpiece in place, checked to make sure the demand valve was working, then slipped the mask down from his forehead and went underwater. There was a convenient sandy space among the rocks at the fifty-foot level. He reached it and turned to count noses. All were present. Visibility was good enough.
Although there is no danger in standing alongside the apparatus, it is much better to spring the hammer by means of a cord of a certain length, since the valve and especially the pyramid gradually burn and may be thrown out. With some kinds of powder the pyramid rapidly melts, and must be frequently replaced.
Besides, if we're going to do anything, we'd better not waste so much time here," Jerry remarked wisely. "Then listen. Here is what it says, scribbled so that I can hardly make it out: * "'On board the balloon Kentucky, and drifting toward the gulf. Our valve refuses to work, and we dare not attempt to land in the dark. Ballast nearly gone. We fear we may be swept out to sea.
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