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Updated: May 16, 2025
"But how does that depth charge work?" asked Charlie Anderson, when the chums were back in their cabin again, discussing what they had better do in reference to telling the captain of the conduct of Labenstein and Secor. "It works on the principle that water is incompressible in any and all directions," answered Blake.
"Water is considered to-day, sir, to be an incompressible body," said the mechanician; "never lose sight of that fundamental principle; still it can be compressed, though only so very slightly that we should regard its faculty for contracting as a zero. You see the amount of surface presented by the water at the brim of the flower-pot?" "Yes, sir."
The facts are; first that water, being all but incompressible, is hardly any heavier, and just as liquid, at the greatest depth, than at the surface; and that therefore animals can move as freely in it in deep as in shallow water; and next, that as the fluids inside the body of a sea animal must be at the same pressure as that of the water outside it, the two pressures must balance each other; and the body, instead of being crushed in, may be unconscious that it is living under a weight of two or three miles of water.
He then applied two pistons to these apertures, pressed by forces proportional to the respective apertures, and the fluid remained in equilibrio. “Having established this truth by two methods equally ingenious and satisfactory, he deduced from it the different cases of the equilibrium of fluids, and particularly with solid bodies, compressible and incompressible, when either partly or wholly immersed in them.”
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