Repeat, exhausting moreair each time. Explain the changeof level of the diver, and the risingand sinking. Try a piece of hard■wood in place of the diver. Whatchange in density is there ? 39. Force-pump. — If the piston-rod of a lifting pump is made to passthrough a tight-fitting cover, and… … Fig. 27. strength of the pump. 32 PBINCIPLES OF PHYSICS. to make the piston solid, and place the upper valve at theside in the tube through which the water leaves the pump,as shown in Figure 27, page 31. Make diagrams of a force-pump, with the piston ascending,and with the piston descending. What…
Physics
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