Constant of Ice and Alcohol at very Low Temperatures. 11 



Table IV. — Brass Cod denser filled with. Distilled Water and frozen 

 into Ice. Ice reduced to —185° C. by use of Liquid Air. 



Deflections of 

 galvanometer 

 when in charge 

 circuit. 



Deflections of 

 gal vanom eter 

 when in discharge 

 circuit. 



Volts on 

 terminals of 

 condenser. 



Mean 

 galvanometer 

 deflection. 



22-4 cm. 

 22 3 „ 

 22-35 „ 



23 -45 cm. 

 23-50 „ 

 23-50 „ 



101 -1 volts 

 101-1 „ 

 101-1 „ 



22-93 cm. 

 22-90 „ 

 22-92 „ 



Mean galvanometer deflection = 22-917. Frequency of contact maker 124. 

 Mean voltage on condenser = 101 *1. 



of 0'4 sq. cm., or 0*17 per cent, of the area of the condenser plate, 

 and taking the specific inductive capacity of the glass as equal to 5'0 

 when cooled to —185° C, it can be seen that the glass supports form 

 0*85 per cent, of the effective capacity of the condenser when the 

 dielectric is gaseous air at —185° G. 



In order to determine this last capacity the brass condenser had its 

 capacity taken at 20° C, air being the dielectric, and then it was 

 cooled in liquid air and then lifted out into the cold gaseous air at a 

 temperature of — 185° C, lying above the liquid air, and in this con- 

 dition the same readings taken. The following were the observed 

 readings of the galvanometer : — 



Table V. — Brass Condenser at 20° C, filled with Gaseous Air at 

 that temperature. Frequency of Contact Maker, 124. 



Deflection of 

 galvanometer 

 when in charge 

 circuit. 



■ 



Deflection of 

 galvanometer 

 when in discharge 

 circuit. 



Volts on 

 terminals of 

 condenser. 



Mean 

 galvanometer 

 deflection. 



8 '32 cm. 

 8-35 „ 



8 -31 cm. 

 8-30 „ 



101 -0 volts. 

 101 -1 „ 



8-315 cm. 

 8-325 „ 



Table VI. — Brass Condenser at —185° C, filled with Gaseous Air at 

 that temperature. Frequency of Contact Maker, 124. 



Deflection of 

 galvanometer 

 when in charge 

 circuit. 



Deflection of 

 galvanometer 

 when in discharge 

 circuit. 



Volts on 

 terminals of 

 condenser. 



Mean 

 galvanometer 

 deflection. 



8 -30 cm. 



8 -48 cm. 



101 -1 volts 



8 -39 cm. 



