16 



Chant — Experimental Investigation into the 



for the brass oscillator, and numerous other readings accentu- 

 ated this result. Afterwards, however, the platinum shell 

 (No. 6) was constructed, and proved the most reliable and effici- 

 ent of all. JSTow this shell was thicker than the calculated 

 " skin " (Table I), and further, on wrapping two layers of heavy 



Table IV. 



Distance of 

 Oscillator 







No. of Oscillator ; scale-readiDg in 



mm. 







from 

 Detector. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. 



No. No. 



cms. 



1. 



2. 



5. 



6. 



1. 



8. 



9. 



10. 



11. 



12. 



13. 



14. 



15. 



16. 



30... 



37 



46 



47 



46 



37 



39 



39 



52 



40 



48 



49 



46 



57 



44 





47 



26 



49 



69 



45 





58 





42 





55 





46 



34 





49 







54 







47 

















40-.. 



22 

 26 

 29 



40 



28 



38 

 51 





33 



30 

 39 

 40 



40 



28 

 33 



34 



37 



46 



43 



45 



38 



50--- 



26 



28 



28 



37 





32 



26 



35 



27 



30 



47 



37 



41 



37 





30 



17 



30 



44 







35 





32 





41 





29 







30 







35 







38 

















60_.. 



20 

 26 



28 



26 



32 



39 



47 



35 



30 



19 

 34 



33 



30 

 31 



32 



41 



43 



40 



40 



26 



27 



27 



70... 



18 



22 



-- 



25 



-- 



-- 



32 



19 



28 



28 



27 



28 



31 



26 



36 



29 



80... 



16 

 21 

 20 



21 

 12 



25 



33 

 35 



22 



30 



18 

 38 

 29 



26 



27 

 23 



25 



26 

 35 



31 



30 

 22 





90... 



20 



._ 



24 



.. 



__ 



29 



27 



25 



26 



21 



23 



27 



29 







100... 



18 



22 



-- 



18 

 23 



25 



26 



-- 



26 



23 

 24 



21 



26 



19 



21 



22 



28 



-- 



120_._ 



13 

 15 



17 

 10 



12 



22 

 23 



-- 



20 



14 

 23 



19 



22 

 19 



15 



18 

 26 



19 



25 

 15 



-- 



140... 



11 

 10 



-- 



15 



19 



18 



-- 



15 



11 



17 



14 



17 



13 



15 



15 



17 



-- 



160... 



12 

 10 



12 



8 



8 



12 

 17 



-- 



17 



14 

 21 



14 



14 

 12 



13 



12 

 19 



18 



13 

 10 



-- 



180... 



12 





7 







12 



11 



11 



12 



9 



12 



12 



14 





200... 



8 



5 



6 



11 



__ 



11 



10 



10 



11 



6 



10 



12 



10 











11 



12 









12 













tin-foil (thickness 0'005 cms ) about the mantle and binding it 

 closely there, no alteration whatever was made in its efficiency. 

 The proper conclusion, therefore, seemed to be that, within 

 the limits of the experiments, the thickness of the metal had 

 no effect. 



If one could obtain a thin continuous carbon shell, possibly 

 more decisive experiments might be made, as the "skin" for 

 carbon is comparatively thick, but such was not available. 



