Properties of Iliyli lemperatiire Flauics. 815 



Specimens of these results are given below (Table III. and 

 fig. 4). 



Table III. 



Test 9. — Spark : cover of copper-foil. 



Electroscope exposed. 



Electroscope shielded. 



lime no ■ 



, ■ . x JJenexion. 

 (minutes). 



Temperature 

 (0° 0.). 



146 



Time 

 (minutes). 







Deflexion. 



Temperature 



(0° 0.). 







| 23-9 



236 



14-7 



21 



22-H5 



1 1-45 



26 



22-65 



14-2 



36 



22-4 



1435 



51 



21-9 



1425 



51 



219 



1425 



74 



211 



1435 '" 



70 



21-2 



1425 



85 



20-95 



144 



93 



20-5 



14-4 

 Mean 14-4 







Mean 144 



Test 10. — Spark : cover of thicker tinfoil. 









21-9 



14-8 



o 



21-3 



14-7 



54 





20-0 



14-7 



20 



20-8 



14-7 



66 





J 9-5 



14-75 



37 



201 



14-7 



83 





19U3 



14 7 

 Mean 14'75 



69 



77 



19 



18-8 



14 55 

 14-5 



Meau 1465 





Test 11. — Spark: cover of aluminium leaf with 





wire gauze. 



Electroscope shielded. 



Electroscope exposed. 







24-05 



16-6 







25-2 



16-5 



50 





22 65 



16-45 



23 



24-6 



16-55 



86 





213 



16 5 



Mean 16v> 

 ! 



b8 



230 



164 

 Mean 165 





Test 12. — Spark : cover of aluminium leaf with 





wire gauze. 









25-0 



17-6 







25-4 



17-8 



52 





229 



177 



14 



249 



179 











49 



— 









Mean 17"65 







Mean 17'85 



