Mr. J. Satterly on the Amount of Radium 

 Table II. 









Amount accu- 



Amount accu- 



Date of 



Charcoal 



Period of 



mulated in tbis 



mulated per 



Testing. 



Tube. 



Eest in 



period expressed 



day expressed 







days. 



as cms. per 



as cms. per 



1909. 







min. leak. 



min. leak. 



Mon. Feb. 1 ... 



A 



3 



*8 



•32 



„ „ 8 



A 



6 



23 



•57 



Wed. Feb. 10 ... 



B 



6 



2-9 



•72 



Mon. Feb. 15 ... 



B 



3 



11 



•44 



n 



A 



6 



11 



•28 



Tues. Feb. 23 ... 



A 



4 



13 



•42 



n 



B 



4 



•8 



•26 



Mon. Mar. 1 



B 



3 



1-4 



•56 



»> »» ••• 



A 



3 



12 



•48 



Mon. Mar. 15 ... 



A 



5 



14 



•39 



>! 



B 



5 



21 



•59 



Mon. Mar. 22 ... 



B 



3 



1-3 



•52 



Moii. Mar. 29 ... 



B 



3 



1-1 



•44 



»> >» ••• 



A 



3 



1-2 



•48 



Mon. Apr. 26 ... 



B 



25 



1-8 



•30 



ii 



A 



25 



1-7 



•28 



Mon. May 3 



B 



3 



10 



•40 



>• » ••• 



A 



3 



1-1 



•44 



Mon. May 17 ... 



B 



3 



31 



1-2* 





A 



3 



5-3 



2-1* 



Mon. May 24 ... 



B 



3 



1-4 



•56 



» 



A 



3 



1-4 



•56 



Mon. May 31 ... 



B 



3 



1-2 



•48 



» 



A 



3 



1-3 



•52 



Mon. June 7 



B 



3 



11 



•44 



>> »» ••■ 



A 



3 



1-3 



•52 



Mon. June 21 ... 



B 



3 



10 



•40 



„ „ 



A 



3 



1-6 



•60 



Mon. July 19 ... 



B 



27 



26 



•43 



Mon. Aug. 2 



B 



10 



19 



•37 



i> >> ••• 



A 



10 



24 



•47 



Tues. Aug. 10 ... 



B 



4 



1-5 



•48 



,, 



A 



4 



1-9 



•61 



Mon. Aug. 23 ... 



A 



3 



1-8 



•71 



»» »> • * * 



B 



3 



12 



•48 



Thur. Oct. 14 ... 



A 



48 



2-8 



•47 



»> >> 



B 



48 



2-7 



•45 



* Very high. Eejected when finding the mean value. The tubes had been 

 opened up and the supply of charcoal replenished on May 15. 



Procedure of Testing. 



(1) Exhausted the testing vessel with an oil-pump, refilled 

 with dry air, took the air-leak : leak = 1*0 cm. per min. 



(2) Meanwhile heated tube A on the furnace, and collected 

 in succession two aspirators full ; call them a and b. 



