? 20. Is there any such thing as a labor-saving machine? 21. Of how many and what simple machines does a crane consist ? CHAPTER IV. MECHANICS OF FLUIDS. Pressure of Fluids. — Fluids belong to that kind ofmatter in which the attracting and the repelling forcessustain such relation to each… … Fig. 25. The action of gravity upon liquidsis everywhere manifest — in the fall-ing rain, the running streams, etc.; but to perceive itsaction upon the air we must study the question carefully.If we place our hand in a pail ofwater, we do not feel the weight orpressure of the water upon it; if…
Physics
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