TABLE 1 

 Capacitance Readings as Described under "Evaluation of Errors" Micromicrofarads 



* Not measured. 



Note: Readings 5 and 9 given in parentheses are derived from readings 6 and 10 respectively using average values for 

 readings 8 and 11. 



TABLE 2 

 Values Computed from Table 1 and Comparison with Measured Values 



Value Computed 

 (mmf. unless otherwise stated) 



Phenol Fibre 



Hin- ^sin. 



^m. 



Hin. 



Hard Rubber 



^in. 



Km. 



y%m. 



Glass 



.455 in. 



.338 in. 



.232 in. 



.080 in. 



(1) Cap. of 6 in. square electrode 

 to ground — Reading 1-2 

 (Table 1) 



(2) Ditto by direct meas. Read- 

 ing 3..." 



(3) Fringe effect 4} 2 in. circle to 

 6 in. square — Reading 5-4.. . 



(4) Ditto in per cent 



(5) Stray cap. to grd. from 434 

 in. upper with 6 in. lower 

 electrode (6-5) 



(6) Ditto by direct meas. Read- 

 ing 8 



(7) .A.dditional capacitance due 

 to metal ring Reading 7-6 . . . 



(8) Ditto in per cent 



(9) Fringe effect 4^ 2 in. circle to 

 4J-2 in. circle — Reading 9-4. . 



(10) Ditto in per cent 



(11) Stray cap. to grd. from AYi 

 in. upper with 4)-2 in. lower 

 electrode (10-9) 



(12) Ditto by direct meas. Read- 

 ing 11 



(13) Fringe effect by KirchhofT's 

 formula for AlA in. circles in 

 air (per cent) 



*Not determined. 



10.4 

 26.2 



4.7 

 11.8 



3.2 

 3.2 



10.5 

 22.4 



0.5 



0.8 



1.3 

 2.7 



4.5 

 9.3 



2.6 

 2.6 



10.8 

 13.5 



1.4 

 1.3 



4.4 

 5.5 



3.3 

 3.0 



2.8 

 3.3 



10.6 



7.2 



0.5 



1.0 



3.1 

 2.1 



4.1 

 2.8 



2.4 

 2.3 



2.8 



6.2 

 21.4 



0.6 



0.7 



1.2 

 4.1 



2.6 

 9.0 



2.1 

 2.3 



13.9 



2.7 



3.3 



6.8 

 16.1 



0.3 



0.6 



1.9 

 2.6 



2.9 

 6.8 



2.0 

 2.3 



10.7 



5.3 

 3.3 



7.7 

 8.8 



0.3 



0.7 



2.1 

 2.4 



3.7 

 4.3 



1.1 

 2.1 



6.6 



12.6 

 20.5 



13.0 



15.8 



13.5 

 11.4 



12.0 

 3.4 



5.2 



8.4 



6.0 

 7.3 



5.9 

 5.0 



4.6 

 1.3 



572b 



