388 Mr. W. B. Morton on the Effect of Capacity 



Table I. 





b. 



b. 



a. 



Calc. 



Obs. 



2-0 



34-7 



33-1 



6-0 



19-8 



17-5 



8-0. 



134 



12-9 



10-0 



103 



10-5 



120 



8-5 



8-7 



14-0 



7-7 



79 



200 



5-9 



5-9 



30-0 



37 



3-9 



330 



2-7 



3-1 



The other observations were made at the end of the wires 

 of a large oscillator in the manner already described. In the 

 calculation both formulae had to be used. First, a measure- 

 ment without the interposed condenser gave directly a value 

 of \ for a given value of c. Then from formula (1) by use of 



S 

 these values the constant -^ was found. In working up the 



subsequent observations with condenser S L in position, know- 

 ing c gave X from formula (1), then A., a, b in (2) gave a value 



of -s- . Using the mean of such values the calculated b's 



were got as already indicated. 



The parallel wires were about 20 m. long, 2 millim. dia- 

 meter, and 10 centim. apart. The plates of condensers Si and 

 S 2 were of 8J and 20 centim. diameter respectively. Uncer- 

 tainty of node position from one to two centimetres. 



Table II. 

 Distance of plates of S 1? 0*5 centim. ; of S 2 , 3*7 centim. 

 Without Si, c=44-5; a + 6=^=302'5. Hence ^ = 132v 



c. 



\ 



2" 



Calc. 



a. 



i. 



b. 



Obs. 



Obs. 



Calc. 



Obs. 



451 



304-6 



4-4 



2995 



296-0 



51-3 



326-6 



54-9 



82-5 



77-8 



50-7 



324-5 



79-7 



55-3 



54-7 



50-1 



322-4 



113-5 



43-3 



42-9 



48-5 



316-8 



161-5 



34-4 



35-7 



46-3 



308-9 



224-3 



28-1 



27-9 



44-7 



303-2 



290-3 



9-3 



10-1 



