40 



REPORT— 1903. 



Table IV. — Values at 16° C. in terms o/(l-0135S x Flat), assuming 



Flat unchanged. 



The values of 1690, 780, 381, and 147 diminish by 17, 15, 15, and 

 7 times 10"° ohms respectively in the interval 1901-1902. No. 147 is known 

 to be a variable coil of very low insulation-resistance, and may be 

 disregarded for the purpose of estimating the change in Flat. It is of 

 interest as being a coil brought to Cambridge by Dr. Lindeck in 1892 and 

 left with the Secretary. 



Thus the apparent /«7^s in value of 3715, 264, 269, 270, 288, 289, 

 1690, 780, and 381 are respectively •017, -015, -020, -017, "017, "017, •OH, 

 •015, and "015 per cent., giving a mean of -017 per cent. 



This justifies the assumption of a rise in resistance of B.A. Flat of 

 •017 per cent, in the period 1901-1902. 



The following tables, V. and VL, are I. and II. revised. They take 

 the change in Flat into account by means of corrections api^lied to the 

 observations of the years 1902 and 1903. The values given are for 16° C. 



Table V. (I. Rerised). 

 B.A.ir. 



Table VI. (II. Rerised). 

 Ohms. 



Tables VII. and VIII. being III. and IV., similarly revised, show no 

 marked change in any of the coils in those tables excepting 147. 



Table VII. (III. Revised). 

 Values at 16° G. 



I 



