CALCULATION OF GEADUATIONS 



V = 0-2813z3 -f 6-492x2 + 47-5.S 

 when x = 2 



V= {0-2813 X (2)3} + {6-492 X (2) 2 } + {47-5 X 2} 

 V= 12322. 



313 



Fig. 217. 



Similarly, calculating the value of V for various values of x ranging from 

 to 6, we have — 



On plotting this table, values of V in gallons against values of x in feet, we 

 obtain the graph shown in Fig. 218, from which the graduations are got as 

 indicated in the figure. For instauce, to find, say, the 2000 gallon graduation 

 mark. From the point 2000, on the horizontal base line of the graph, erect a 

 perpendicular to cut the curve or graph. The point in which the perpendicular 



