158 I'll. V- II. ;i;IFFITIIS AND MR. K/F.R GRIFFITHS ON THE 



\ ^iniill uncertainty in tho value of S has but little effect on j-^', for example, 



an error of (VI in x would only produce an error of 1 in 2000 in the above value of y. 



A correction of 3 has to be applied to y for the clock rate, which was a losing one 

 of 0'05 sec. per 1000. 



The distribution of the results of the individual experiments about the " most 

 probable point of intersection ' may be determined by solving the equation of each 

 line for its intersection point with the ordinate through x = +0'137. 



TABLK X 



Probable observational error = */-. 2 ( diff erence) 2 = +g 



V No. experiments 1 



Coefficient of variation per cent. = 0'01. 



In Tables XL to XVIII., pp. 161 to 169, we give the value of y (calculated) for 

 h group , Column VII. ; the error per cent. (Column VIII.) being the coefficient 

 of variation obtained as above. 



^ig. 7, p. 150, represents the above group of experiments ; the most probable point 



tion obtained by calculation is shown by a large cross. 



Attention may be drawn to the fact that no " smoothed curves" have been used in 

 the above reduction. 



