One end of a very hot steel bar is sprayed with a stream of cool water. The rate of cooling R (in °F/s) as a function of the distance d (in in.) from one end of the bar is then measured, with the results shown in the following table. On log-log paper, plot R as a function of d. Such experiments are made to determine the hardness of steel.

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d (in.) R (°F/s) d (in.) R (°F/s) 0.063 0.13 0.19 0.25 600 190 100 72 0.38 0.50 0.75 1.0 1.5 46 29 17 10 6.0