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A loud hissing sound came from the air-valves; but it was every moment interrupted, as if some part of the apparatus failed in its continuous working.
That this stimulus of the momentum of the particles of the circulating fluid is of the greatest consequence to the arterial action, appears from the experiment of injecting air into the blood vessels, which seems to destroy animal life from the want of this stimulus of momentum; for the distention of the arteries is not diminished by it, it possesses no corrosive acrimony, and is less liable to repass the valves than the blood itself; since air-valves in all machinery require much less accuracy of construction than those which are opposed to water.
The first to recover his presence of mind was Mildmay, who, springing to the rods which controlled the air-valves, pressed them powerfully down, throwing them all wide open and at once ejecting from the hull both the water and the compressed air, and causing the ship to rise until she floated lightly as an air-bubble on the water.
Orchestra instruments crashed to the floor and dancing couples fell and sprawled inertly while the tortured First Officer swung the door of the lifeboat open and dashed across the tiny room to the air-valves. Throwing them wide open, he put his mouth to the orifice and let his laboring lungs gasp their eager fill of the cold blast roaring from the tanks.
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