558 



Mr. P. E. Shaw on 



Our value would seem to be a 



037 /a/a and is probably less 

 superior limit. 



The Tables VI A., VII a., VIII a. furnish not only the curves 

 on fig. 4 for small displacements (0-10 /a/a), but also those 

 on fig. 5 for medium displacements (10-160 /a/a). Here 

 the readings can be taken with greater percentage accuracy, 

 and the points lie more uniformly along them. 



-Fig. 5. 





































































































































































































































































































































































































































































y 







































































































o 



































































/o 









































































' 



■ 





























80 fiA 160 



80 80 



fifi 



That the curves are not parallel to one another and even 

 cross, as in fig. 5, is not surprising, for the receiver is set 

 up differently for each curve obtained, so that a small differ- 

 ence in the tightening of the diaphragm would make a 

 difference in the ratio current/displacement, and so the general 

 direction of the curve would be different. 



In fig. 4 the curves will be seen to be concave to the line 

 of abscissas. J\ T ow it is obvious that for large currents the 



