136 Lord Rayleigh, On the measurement of the electrical [Mar. 10, 

 Current through PQG. Current through A EG. 



Differences. 



2-67 



•67 



- -9 



-3-23 



If we interpolate between c = 182 and c = 185 we get for the 

 true value of c 183'36, and using the values c = 183, and 184, we 

 get for true value c = 183 '43. Substituting these values of c in 

 the value of x, and putting a = 1, b = 1, G = 65*6 as determined by 

 direct measurement, we get 



a; = -005314 fore = 183-36 

 and = -005313 for c = 183-43. 



The temperature was 14° C. 

 To find limits of error. 



-i TT , abG 



We nave x = - TT - I ^- — ^- , 



G(c + a + b) + bc 



and to a first approximation, a = 1, b = 1, G = 65, c = 183, x = ^^ . 

 Hence 



dx -da(l-x) \ db(l x C+G ) dcx G + 1 I dG ^- cx ) 



X V (x J (r Cr 



7 77 dc dG 

 = da + db- m+m . 



