Plate XXX. 



Fig. IX.— Obtained by twisting nickel wires (?•= 0.50) in varying 

 magnet izing fields. 

 Curve J. for r ±30°, r 0.5 -, Curve II. for r = ±45°, r=0.5; 

 „ III. ,, r = ±60°, r=0.5 ; „ IV. ior r = ±90°, r=0.5 ; 



V. „ r = ±60°, r=0.43; „ VI. for r = ±90°, r=0J48. 

 j. •/,_,. X — Obtained by twisting nickel wire, r being variable. 



Curve I. for 6 = -5.0, r=0.5 ; Curve II. for = 9.8, r=0.5, 



„ III. „ 6=10.5, r=0. 5, u> = 5; „ IV. „ 6 = 9.8, r=0.5,w=8. 

 V. „ 6=32.8, r=0.43 ; „ VI. „ 6 = 9.9,r=0.43,«>=4. 



Fig. XI. — Obtained by reversing the direction of the magnetizing 

 force, with nickel wire (r = 0.5), <Q being variable. 

 Carve I. for r = ±30 ; Curve II. for r = ±90°; 



• „ [II. ,, r = ±180°; „ IV. „ r = ±00°, u-=i; 



„ V. „ r = ± (50°, »c = 8. 

 FYgf. A77. — Obtained by reversing the direction of magnetizing force, 

 with nickel wire (r = 0.43), § being variable. 

 Curve I. for r = ±60° ; Curve II. for r = ±360°; 



„ Hi: „ r = ±60°, w=4; „ IV. for r = ±60°, w=8. 



Fig. XIII. — Obtained by reversal with nickel wires (r = 0.5 and 

 /■ 0.43), r being variable. 



Curve I . f< ir 6= ± 1 0.6, r = 0.5 ; Curve II. for 6 = ±4.5, r=0.5, u- = 5 : 



„III. „ 6=:±9.8,r=0,5,w = 5; „ IV „ 6=±9.8,r=0.43; 

 „ V. „ 6 = ±5.0,r :0.43,i<;=5; „ VI. „ 6=±25.1,r 0.43, w=5. 



Fig. XIV. — Obtained by reversal for r = ±60°, with nickel wires of 

 different thickness, § living variable. 

 Curve I. For r 0.50 ; Curve II. for r=0.65 ; 



„ III. „ r 0.84 : „ IV. ,, r 1.00 ; 



,, A'. ,, r=0.65, w = b. 



Fig. XV. — Obtained by reversal in <Q = ±19.7, with nickel wires of 

 different thickness, r being variable. 

 Curve I. for r=0.50 ; Curve II. for r=0.65 ; 



„ III. „ r=0.84 ; „ IV. „ r=1.00. 



Fig. XVL — Obtained by reversal, r being variable. 



Curve I. for r 0.84,6 3.4, w = 8; Curve II. f or r= 1.00, 6 = 6.3,«? = 8. 



