402 



ME. J. J. MANLEY: OBSEEVATIONS ON THE 



which occur when small loads are used is concave : with a load of about 50 or 60 gr. 

 the concave form gives place to a straight-line curve ; and lastly, as the load is 

 increased, the type of the graph passes over into a form which is convex, the 

 convexity increasing with the load. 



10 II 



16 C. 



A formula of the type 



M = M! (1 ai 



enables us to calculate, in each case, the apparent changes in weight at any 

 temperature within the limits given. 



In the following table we give the determined values for a and /J for the several 

 loads : 



TABLE III. Temperature Coefficients for the Gallenkamp Balance. 



Load. 



0-5 

 60 



100 

 200 



+ 0-000019 

 + 0-000038 



+ 0-000052 

 + 0-000124 



+ 0-0000016 



J" This was obtained by inter- 

 L polating. 



-0-00000034 



-0-0000131 



