37 6 Profs. J. Dewar and J. A.. Fleming. On the Dielectric 



XV. Dielectric Constant of Bismuth Oxide (Bi 2 3 ). 



(Suspended in water.) 



Corrected galvanometer deflection when the condenser has air as- 

 dielectric = 3*97 cm. for 100 volts. 



Observations. 

 Condenser charged to 17*8 volts, 



J- emperature 

 in platinum 

 degrees. 



Mean 

 galvanometer 



deflection 

 in centimetres. 



Dielectric 

 constant. 



-200-0 



1-97 



2-64 



-1997 



1-93 



2-62 



-194-0 



2-00 



2-72 



-185-2 



2-00 



2-72 



-171-0 



2-00 



2-72 



-159-0 



210 



2-88 



-152-5 



2-45 



3-46 



-142-5 



4-40 



6-13 



— 138*0 



6*15 



8'55 



-134-4 



9-90 



13-80 



-129-2 



14-15 



19-9 



-127-3 



1-41 



24-5 



-122-7 



2-15 



37-8 



-117-5 



3-25 



57-2 



-111-0 



4-45 



78-2 



-107-3 



5-10 



90-2 



Before drawing conclusions as 



Condenser charged to 1-434 volts. 



to the dielectric power of these- 

 oxides and hydrates, it seemed important to try the effect of sus- 

 pending in ice small quantities of inert particles, and we therefore- 

 selected finely divided gold and precipitated sulphur as instances of a 

 good conductor and a good non-conductor in very fine states of divi- 

 sion. These finely divided materials were 'suspended in water and 

 frozen and the dielectric constants taken as follows : — 



Dielectric Constant of Ice, having in suspension a small quantity of finely 



divided Gold. 



Corrected galvanometer deflection when the condenser has air as 

 dielectric = 4*04 cm. for 100 volts. 



Temperature 

 in platinum 

 degrees. 



-199-8 

 -196-0 

 -161-7 

 -1490 

 -144-5 



Mean 

 galvanometer 

 deflection 

 in centimetres. 



10- 30 

 9'90 

 5-25 



11- 

 17-0 



Dielectric 

 constant. 



2-60 

 2-39 

 712 



15-0 



232 



Observations. 

 Condenser charged to 98*5 volts. 



Condenser charged to 18*0 volts. 



