28 



Mr Molin, An examination of SearWs method 



the various observations being regarded as having equal weights. 

 The values of a and ^ have been thus calculated for seven different 

 lines, and the results are given in Table 2. 



Table 2. 

 Values of a, § and k. 



1 



When I = 0, then MT = ^, and Table 2 shows how ^ varies with M. 

 The curve thus extrapolated for ^ = is marked "Calculated for 

 Z = 0" in Diagram 1. 



When MT = 0, we have ^ = | ^ | = | /3/a | , where k is the 

 correction for the lower end of the rotating cylinder. 



0,7 

 0,6 



qs 



Q3 



10 ZO 30 ^O 50 60 70 80 90 100 110 ISO ISO 1^^o I^ gr. 



Diagram 2 shows how k depends upon M. 

 The facts here recorded show that equation (2) should be 

 replaced by 



M,T 



-n^c 



i + k,' 



where k^ is the value of k corresponding to the load M^. 



.(3) 



