464 



TRANS. ST. LOUIS ACAD. SCIENCE. 



At 4:55, Cg being removed, the suspended magnets read 



h. 1 .. 



.95 



r9.35 



The mean reading of No. i was 78.7 and the readings of Cj^ 

 were corrected to this value as is shown in the following table, 

 which explains itself. In applying this correction to Cj^ the sign 

 of the correction, for reasons before stated, is of course reversed. 



:\ 



1 o 



For the lower temperatures, /^ Series I. and III., we have the 

 mean readings : 



/q. Cj- reads 



Series 1 67., 151. ,3 



" III 66.g 151-66 



Mean 67. ^^ 151.^3 



For the higher temperature, 



/. Ci 7 reads 



Series II 104-3 i5°'o4 



Hence a change in temperature of 37°. j ^ F. produces a change of 

 1.42 divisions in the reading of Cj^. 



