CAPACITY FOR HEAT OF MKTAI.S AT DIFFKKI.NT TKMI'ERATfKKS. 



157 



Hence 



"Total rise above" = 0'088 + 0'0099 = 0'0979 C. 



'I'lie figure on p. 145 represents the above data.* 



TABLE IX. Calculation of the Co-ordinates of the " Most Probable Common 



Point of Intersection." 



Multiplying each term by the coefficient of x in the same equation 



3620+ 131044s = 141346, 

 2320+ 53824o- = 90559, 

 1440+ 20736Z = 56190, 

 13924J? = 46029, 

 8281-r = 35500, 



Mean 



0+240sc = 39031 (2) 



Solving equations (l) and (2) for x and we have the co-ordinates of the required 



point 



x= +0-137, 



= 38998. 

 Expressing x and y in absolute measure we have 



fa: x O'l = degrees Pt, 



0x10-"=-,^. 



>M* ft 



Hence 



n 



N = +0-0137 Pt, 



I^N = 38998 XlO- 9 . 

 n 1 tit 



* This figure indicates how the " rise above corrected " can be obtained more simply by the prolongation 

 of n straight line. 



