D. W. Shea — Calibration of an Electrometer. 207 



Resistance be- 

 tween point to 

 ground and point 

 to pair quad- 

 rants in ohms. 



1000 

 2000 

 3000 

 5000 

 7000 

 8000 

 9000 

 10000 



Charge of Needle, 40 volts. 



i. 



Temperature, 6° C. 



Charge of 

 quadrants 

 in. volts. 



2*5 



5-0 



7-5 

 12-5 

 17-5 

 20-0 

 22-5 

 25-0 



Scale readings in cm. 



« 



2-13 



4-30 



6-28 



10-07 



13-46 



15-05 



16-49 



17-92 



2-17 



4-20 



6-20 



9-85 



13-34 



15-00 



16-41 



17-94 



Mean of 



two Deflection of 



scale needle in 



readings. degrees. 



2-15 



0°29'-5 



4-25 



58 



6-24 



1 25 



9-96 



2 15-5 



13-40 



3 2 



15-02 



3 24 



16-45 



3 43 



17-93 



4 2-5 



II. 



Temperature, 8° C. 



1000- 



2-5 



1-93 



1-92 



1-925 



26 



2000- 



50 



3-81 



3-79 



3-80 



52 



3000- 



7-5 



5-64 



5-61 



5-625 



1 17 



5000- 



12*5 



9-17 



9-12 



9-145 



2 4 



7000- 



17-5 



12-85 



12-84 



12-845 



2 54 



8000- 



200 



14-60 



14-68 



14-64 



3 19 



9000- 



22-5 



16-29 



16-23 



16-26 



3 40-5 



oooo- 



25-0 



17-79 



17-78 



17-785 



4 1 



Temperature, 11° C. 



1000- 



25 



2-03 



2-04 



2035 



0°28' 



2000- 



5-0 



4-03 



4-03 



4-03 



55 



3000" 



7-5 



5-94 



6-02 



5-98 



I 22-5 



5000- 



12-5 



9-95 



9-99 



9-97 



2 16 



7000- 



17-5 



13-70 



13-76 



13-73 



3 6-5 



8000- 



20-0 



15-76 



15-84 



15-80 



3 34-5 



9000- 



22-5 



17-89 



17-91 



17-90 



4 2 



10000- 



25-0 



19-81 



19-87 



19-84 



4 28 



Temperature, 12° C. 



1000- 



2-5 



1-91 



1-89 



1-90 



26 



2000- 



50 



385 



3-87 



3-86 



52-5 



3000- 



7-5 



5-90 



5-95 



5-92 



1 20-5 



5000- 



12-5 



10-08 



10-12 



10-10 



2 17-5 



7000- 



17-5 



14-30 



14-33 



14-315 



3 14-5 



8000- 



20-0 



16-50 



16-54 



16-52 



3 44 



9000- 



22-5 



18-71 



18-80 



18-75 



4 13-5 



10000- 



25-0 



20-79 



20-82 



20-805 



4 47 



