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Why, good Heaven! if I was to lose the support and recognition of Chivery and his brother officers, I might starve to death here. While he spoke, he was opening and shutting his hands like valves; so conscious all the time of that touch of shame, that he shrunk before his own knowledge of his meaning. 'I ha! I can't think what it's owing to. I am sure I cannot imagine what the cause of it is.
He became thoroughly familiar with the intricacies of fire-box, boiler, valves, levers, and gears, and liked nothing better than to handle the locomotive himself during the run. On one trip, when the engineer lay asleep while his eager substitute piloted the train, the boiler "primed," and a deluge overwhelmed the young driver, who stuck to his post till the run and the ordeal were ended.
When the gas in the bag had diminished by leakage through the valves and elsewhere so that it was no longer sufficient to carry the car, the liquid hydrogen was to be turned into gas which was to take the place of that lost. Ned had left Washington with sixteen cubic feet of the liquid in eight delicate Dewar bulbs, or casks.
The clams and oysters show even more clearly what we might call the logical results of molluscan structure. They increased the shell until it formed two heavy "valves" hanging down on each side of the body and completely enclosing it.
Explain how the different parts of the heart act, while they are pumping and receiving the blood. 12. How many strokes of the heart-pump are there per minute in a man? a woman? a child? 13. Which part of the heart has the thickest muscle and why? 14. Where are the strongest valves? 15. What blood vessels carry the blood to and from the lungs? 16.
Let us assume further how much less the heart will hold in the contracted than in the dilated state; and how much blood it will project into the aorta upon each contraction; and all the world allows that with the systole something is always projected, a necessary consequence demonstrated in the third chapter, and obvious from the structure of the valves; and let us suppose as approaching the truth that the fourth, or fifth, or sixth, or even but the eighth part of its charge is thrown into the artery at each contraction; this would give either half an ounce, or three drachms, or one drachm of blood as propelled by the heart at each pulse into the aorta; which quantity, by reason of the valves at the root of the vessel, can by no means return into the ventricle.
When the valves are raised and brought together, they form a three-cornered line, such as is left by the bite of a leech; and the more they are forced, the more firmly do they oppose the passage of the blood. The tricuspid valves are placed, like gate-keepers, at the entrance into the ventricles from the venae cavae and pulmonary veins, lest the blood when most forcibly impelled should flow back.
The engine-room, too, was vacant, and quite as unsavory as the other dens on board. Perry patronized the engine by a pull or two at the valves, and continued his tour of inspection. The Ambuster's skiff, lying on her forward deck, seemed to entertain him vastly. "Jolly!" says Perry. And so it was a jolly boat in the literal, not the technical sense.
Their ship, an ancient, barque-rigged vessel of 1,000 odd tons; auxiliary engines capable of pushing her along at 9.35 knots with the safety valves lifting; and armed with I forget how many bottle-nosed, 5-inch, B.-L. guns and a Nordenfeldt or two, was swinging peacefully round her buoy in the harbour.
I now felt safe against being caught napping by the Morlocks, and, stretching myself, I came on down the hill towards the White Sphinx. I had my crowbar in one hand, and the other hand played with the matches in my pocket. 'And now came a most unexpected thing. As I approached the pedestal of the sphinx I found the bronze valves were open. They had slid down into grooves.
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