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Updated: April 30, 2025
When all these openings have been carefully closed and fastened, then begins the maneuver of submersion. The sea water is admitted into big open tanks. Powerful suction engines, in the central control of the boat, draw out the air from these tanks so as to increase the rapid inrush of the water.
For, they realized, the suction would be so strong when the vessels took their final plunge, that all those anywhere near in the water would be drawn under. Captain Raleigh sent a hail across the water in a loud voice. "Are you there, Reynolds?" "Right here, Raleigh," came back the response. "There is no hope here. How about you?" "No hope here either," was Captain Raleigh's answer.
Of this concept of suction we must now observe that we may apply it with justification only if we realize that suction can be caused in two different ways. In the sense in which we are wont to use the term, suction is the result of a difference of pressure in adjacent parts of space, the action taking place in the direction of the minor pressure.
The edge of the bell is smeared with vaseline, and the suction applied for from five to ten minutes at a time, with a corresponding interval between the applications. Each sitting lasts for from half an hour to an hour, and the treatment may be carried out once or twice a day according to circumstances.
We were told that horses and cattle exposed upon the plain were sometimes taken up in the suction of air caused by their progress, carried a hundred rods or more, and then dropped to the ground lifeless. Other stories were heard of the erratic performances of sand-spouts on the Mexican plateau, but they were of a nature requiring too much credulity for us to repeat them in these pages.
It sounds very easy and commonplace when one says "hard rowing," but it takes on more significance when one is reminded that those oars were 18 feet long, 5 inches through, and weighed about 20 pounds each; the boat was 30 feet long, a demasted schooner indeed, and rowing her through shallow muddy water, where the ground suction was excessive, made labour so heavy that 15 minute spells were all any one could do.
From this it was evident that the suction had been the means of recalling, to the neighbourhood of the injury, such portions of the poison as had expanded, concentrating all in one mass immediately beneath its surface, and thereby affording fuller exposure to the action of the final remedy.
It grew louder and louder, and the boys felt a strange suction of wind which made them hold tightly to the rail for fear of being pulled overboard by some uncanny force. There followed a loud snap and a crash, and the mast began to come down. "Look out for the mast!" screamed Captain Jerry, and all jumped just in the nick of time.
When the water finds an outlet through the bottom of a dam, a suction or whirling vortex is developed that generally goes round in the same direction. A morning-glory or a hop-vine or a pole-bean winds around its support in the same course, and cannot be made to wind in any other.
From this it was evident that the suction had been the means of recalling, to the neighbourhood of the injury, such portions of the poison as had expanded, concentrating all in one mass immediately beneath its surface, and thereby affording fuller exposure to the action of the final remedy.
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