Magnetic Permeability of Liquid Oxygen and Liquid Air. 289 



OBSERVATIONS ON MAGNETIC PERMEABILITY OP LIQUID OXYGEN. 

 Throws of Ballistic Galvanometer. Induction Coils balanced. 



{ 4 '0 mm. to left T The transformer in liquid oxygen. 



4 '2 V Primary current = 37 '8 amperes reversed 



4 *3 J through primary coils. 



I "] The transformer lifted out of liquid oxygen 



17 -0 mm. to right | i n t, n 00 ia gaacous oxygen at the same tem- 



Exp. II. <j 17'5 } perature. 



18 '5 ,, j Primary current = 37*8 amperes reversed 



J through primary coils. 



r 3*2 mm. to left -i The transformer in liquid oxygen. 



Exp. III. 2 '5 I Primary current = 37 *2 amperes reversed 



I 2*8 J through primary coils. 



"^ The transformer lifted out of liquid oxygen 



I 20 '0 mm. to right | into cold gaseous oxygen at the same tern- 



Exp. IV. <{ 21 -0 [ perature. 



21-3 I Primary current = 36 '8 amperes reversed 



J through primary coils. 



Throws of Ballistic Galvanometer in Standardising Observations. 

 Primary Coil of Balancing Coil disconnected. 



. "| Corresponding to 0'1145 ampere reversed 

 through primary coil of the transformer, 

 " " the transformer being in liquid oxygen. 



25 * " | The mean of these ballistic throws is the 



' " " quantity denoted by d, and the current 



25 ' " " J G'1145 ampere is the a in the formula above. 



Standardising Observations repeated with another Current. 



r T Corresponding to '2639 ampere reversed 



Exp. VI. \ 58 ' 0mm - tori g ht I through primary coil of transformer, the 

 t 58 "0 J transformer being in liquid oxygen. 



Throius of Ballistic Galvanometer. Induction Coils balanced. 



f "1 The transformer lifted out of liquid oxygen 



into cold gaseous oxygen at same tempera- 

 El p.TII. \ *'0. to right ! ture 



4 ' Primary current = 8 '037 amperes reversed 



I J through primary coils. 



{0 '4 mm. to left The transformer in liquid oxygen. 



.4 }) M I Current = 8 -095 amperes reversed through 



'2 ,, J primary coils. 



r 4-5 mm. to left 1 The transformer in liquid oxygen. 



Exp. IX. J 4 '8 !> Current = 28 '8 amperes through primary 



4-2 , J coils. 



