THE INDICATOR DIAGRAM . 137 cylinder , or down stroke of the low - pressure piston . For large power this is an advantage , as the descent of the large piston is High and Low Pressure Cylinders combincd . Top * Total indicated power , 1551 . Steam , 40 lbs . Vacuum , 28 inches . Revolutions , 33 . … Figs . 82 , 83 . — Compound Engine Eiagrams . better balanced than if great steam pressure was admitted into the cylinder . Again , when the steam is raising the small piston , it will be seen that more steam is admitted , the cut - off taking place at a later period . The diagram for the large…
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