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\ \ ^ o 1 "^ \ \* \, r X \ / 34 S ff 7 S 9 /o // /S /3 /# /f /g /7 /& /9 ffours WCTCP/STfC CURVE OF BO/LCQ WOPffED flT KWM/YC &/JTE5.
/? H Barker, c/etf.
FIG. 105.
Each rate of combustion could be represented by
a different hori- zontal line.
All the points, such as P representing the end of the combustion, would lie on the rectangular hyperbola PP. A rectangular hyperbola has the property that the area under any point P on it such as OXPY is constant.
398 BARKER ON HEATING. CHAP. Xix.
In this case it would represent 1, 820, 000 B. T. U. , or in other words, it would be equivalent to 1, 820, 000 91 square umt8 ' as shown on the diagram.
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