The friction of the surface of the vase against theimprisoned air may be increased by attaching radialfeathers of thin metal to the interior of the walls ofthe vase. Our co temporary says that with a fan 35 inches indiameter, rotating 950 tuns per minute, a pressure isobtained equal to that of 8… … rotation of 1,900 revolutions per minute the pressureis equal to that of 31 inches of water, which is a littlemore than a pound to the square inch. It is easy to see that a rotary pump may be madeon the same principle by having the pipes open intowater instead of air. A STEAM ENGINE GOVERNOR ON…
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