an Electric Micrometer, 



559 



curve will be convex in the above sense, and we might 

 reasonably expect it to be so throughout the curves to the 

 origin. But i£ the curve when very near the origin has a 

 point of flexure as supposed, we see the importance of 

 plotting the curve in this region so as to obtain its true shape. 

 This peculiarity might arise from (1) a " buckle " in the 

 diaphragm ; (2) irregularities in the field. But we have no 

 data for deciding between these various speculations. 



Table IX a. 



Similar to Tables VI., VII., VIII., but having larger 



diaphragm displacements. 



Move- 

 ment. 





Corr. 





Current 



Move- 

 ment. 





Corr. 





Current 



Mean. 



Mean, 



Throw. 



and 



Mean. 



Mean, 



Throw. 



and 





Up. 





Resistance. 





fifi. 





Resistance. 



0-70 











120 











0-70 



0-72 



75 



1-30 



2000 oj. 



12 05 



12-0 



1250-0 



130 



20 w. 



0-75 









C=472 



11-95 









C=7140 



1-30 











135 











1-30 



1-297 



1340 



2-0 



1000 a>. 



134 



13-47 



1397-0 





10 w. 



1-29 









C=893 



135 









C = 7690 



2-50 











51-2 











260 



2-53 



2630 



3-40 



500 w. 



520 



51-2 



53200 



55-2 



10w. 



250 





■ 





C = 1610 



505 









C=30,760 



53 











52-8 











5-4 



5-33 



554-0 



6-8 



200 a.. 



52-0 



526 



54700 



56-9 



5 <o. 



5-3 









C=3125 



530 









C = 32,000 



7-5 











540 











7-J) 



737 



767-0 



8-3 



100 a,. 



54-5 



54-3 



5650-0 



57-5 



2w. 



77 









C=4540 



54 5 









C= 32,800 



9-8 





















9-9 



9-83 



1020-0 



10-5 



50 w. 













98 









0=5880 













TT M V i First six sets T430 V. constant. 



' ' |_ Last three sets 5900 V. constant. 



Table IX b. 



Kind of Impulse. 



Volts. 



Main 

 Resistance. 



Cell 

 Resistance. 



Current. 



Begins to be comfortably loud , ... 

 ., „ uncomfortably loud ... 



1-43 

 1-43 

 60 



10,000 w. 

 100 u.. 



5 to. 



2 a,. 

 2o>. 



8 u>. 



100 



4,500 

 30,800 



