d links. duced by the action of cords on rigid bones. Foucault com- The octopus uses the hydrostatic press alone to propel 4. Hydrostatic press. pares the motions of a fish’s tail with that of a propeller, itself in the water. At first sight it would seem as though The elementary machines have been… … the above may be the simplest for present purposes. The would be extremely unfavorable to motion, but a little closer cannot approach the perfection of this animated instrument examination will show that it arranges them in the position principle of the lever has already been stated, and it…
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