386 W. R. Morse—New form of Magneto-electric Engine. 
No. 16.— Upon the induced currents produced by the application 
of armatures to Horseshoe magnets and a new form of Magneto- 
electric Engine ; by W. R. Morse. 
The apparatus consisted of cylindrical horseshoe electro- 
magnets, the wires of which were wound about the iron cores 
at the bend of the iron, so as to form practically straight electro- 
magnets with cores horseshoe in form. Upon one of the limbs 
of the horseshoe core a coil of fine wire was slipped so that 
the plane of its coils was at right angles to those of the electro- 
magnet. In fig. 1, A represents the 
1. B coil of the electro-magnet; B that 
of the induction coil. Upon excit- 
ing the electro-magnet induction 
currents arose in the coil of fine 
wire B both at making and breaking 
the circuit. These currents were 
oO 
| D eter placed in the circuit of the coil 
ue. The readings are expressed in the divisions of the scale 
of the reflecting galvanometer. 
After removal After removal 
Without armature. With armature. of the armature. of the armature. 
1st deflection. 2d deflection. 
170 210 210 170 
170 209 209 170 
175 209 209 170 
170 210 210 175 
These results show that a marked increase (in these experi- 
ments, nearly twenty-five per cent) in the strength of the induc- 
tion currents results from the application of an armature to the 
poles of the electro-magnet. The third and fourth columns of 
the table show that after the removal of the armature, the first 
induced current which results from again making the current 
in the electro-magnet shows the same increased effect; but 
that the following current resulting from breaking the cir- 
cuit of the electro-magnet falls to its normal amount. This 
result is noteworthy, for it shows a certain molecular change 
in the iron which results from the application of the armature. 
Although we can thus increase the strength of the induction 
currents produced in coils slipped upon the limbs of an electro- 
