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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 104

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 104
r a jjiston, provided with a valve opening outward,and crowd it down to the bottom of the cylinder.As it is pushed down, the air in the cylinder willopen and pass through the valve, as shown by thearrow. When the piston has reached the bottom ofthe cylinder, the valve will close by its own… … 98 PNEUMATICS. counted for only by the downward pressure of the air (shown by thesmall arrows), it is taken for its weight; which, it has been found byexperiment, is 15 potmds to the square inch, at the level of the sea.Hence, as fluids press in all directions alike, the 2}ressure of the…

Physics · Astronomy

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