18 



Chant — Experimental Investigation into the 



were fastened on each sphere, at the extremities of a diameter, 

 by electro-deposition of copper. 



The results obtained with the three oscillators are given in 

 Tables Y, VI and YII, which explain themselves. With the 



Table VI. 

 Spheres 4 cms in Diameter. 



Distance of 





Detector posi 



ion ; an 



d scale reading 



s in mm 



. 





Oscillator 



















from 

 Detector. 



I 



II 



III 



IY 



Mean. 



cms. 



1 



2 



1 



2 



1 



2 



1 



2 











l. 



Solid . 













30 



73 



64 





60 



65 



56 



68 



50 



62-3 



50 



33 





46 



40 



30 



43 



32 



30 



36-3 



100 



26 



28 



20 



18 



16 



17 



14 



10 



18-6 



140 



18 



15 



12 



10 



10 



10 



7 



10 



11-5 



200 



8 



8 







9 







5 



4 



6-8 



250 



8 



9 



9 



7 



7 



6 



4 



.. 



7-1 



300 



6 



5 



7 



5 



5 



5 



3 



2 



4*8 









2. 



Shell. 













30 



70 



43 



74 



60 



66 



48 



60 



51 



59-0 



50 



32 



31 



40 



36 



28 



33 



33 



33 



33-3 



100 



15 



14 



15 



16 



14 



15 



18 



16 



15-4 



140 



7 



9 



15 



11 



10 



13 



11 



11 



10-9 



200 



10 



9 



10 



6 



5 



9 



7 



7 



7-9 



250 



8 



10 



8 



S 



6 







6 



8 



7-7 



300 



7 



7 



12 



7 





-- 



5 



4 



7-0 



solid spheres the first reading was usually the highest, but with 

 the shells there were usually two or three indifferent ones to start 

 with. This was observed with platinum faces generally. The 

 readings recorded are : for the solid spheres, the first 8 taken ; 

 for the 4 cm shells, the first 8 ; for the 2 k 5 cm shells, the last 8 of 

 a series of 14 ; and for the 10 cm shells, all the satisfactory read- 

 ings obtained. 



The 4 cm spheres seem to show evidence, at the distance of 

 30 cms , of the reversal effect mentioned above, but it disappeared 

 before a distance of 50 cmB was reached. With the other spheres 

 no trace of the phenomenon can be found. 



No difficulty at all was experienced in handling the smaller 

 spheres, but the larger ones gave some trouble. But a single 

 reading had been secured with the first pair of 10 cm shells 



