Experiments on the High-Tension Magneto. 373 



The excitation o£ the primary current is effected by the 

 rotation in the gap of the yoke of the laminated iron 

 inductor I, which connects magnetically the ends of the 

 yoke to the poles of the magnet and reverses the connexion 

 twice in each revolution. The portion a a', carrying the 

 circuits, is easily detachable, so that one set of windings 

 may be easily replaced by another. 



Fig. 7. 



A/--"" 



Ll-S-n Q Q P-Q 9 Q CLP fl 



u 



L. 



-, ,fi£i 



I 



! Elevationa/. 

 • Section. 



..J 



hh 



N\ 



1 -A 



Se ction 



THROUGH pp' 



SVh" 



45! 



Through the kindness of Mr. A. P. Young, of the British 

 Thomson-Houston Co., special experimental armatures were 

 wound to fit the standard machine. No. 1 had 160 turns in 

 the primary and 10,000 in the secondary; No. 2 160 primary, 

 <S000 secondary ; No. 3 160 primary, 6000 secondary ; 

 No. 4 no primary, 4000 secondary ; No. 5 no primary, 

 2000 secondary. A second housing was also provided. 

 One of the armatures with primary windings was fitted into 

 one housing (A), and one of the other armatures into the 

 other housing (B) ; the secondaries of the two armatures 

 were then connected in series. Thus only the part of the 

 secondary circuit wound on the first armature was coupled 



