206 EF. L. Carney—Hfect of Vibrations upon Electro-magnets. 
Iron rod. 
Current made. on ney *Y | Current broken. Cure dec by 
+ + 
Bp 60 55 70 
70 62 45 65 
70 47 55 65 
68 60 
Steel rod. 
Current made. Were eevee OY Tu ont mada ee by 
27 29 30 18 
28 5 30 24 
30 15 26 17 
Table IV.—In all the previous cases the circuit was made 
while the rod was not vibrating. : 
Now the rod was first set in vibration, and the magnetizing 
circuit was made while it was vibrating, and the deflection 
noticed; when the rod came to rest, a tertiary current was ex- 
cited by setting it again in vibration. ; 
Here again more than one tertiary current was obtained, 
which could not have been due to the feebleness of the first 
vibration. : 
It will be noticed that the deflections obtained by the tertiary 
vibrations are opposite in direction to those obtained by the 
secondary ones, as was also the case in Table I 
On the iron rod the ma: netizing helix was distant forty cen- 
timeters from the center; on the steel one fifteen. 
Iron rod. Steel rod. 
Current made while | Current caused by ||Current made while | Current caused by 
vibrating. vibration only. || rod was vibrating. | vibrations only. 
- as - 
95 80 60 10 
70 80 48 18 
80 95 50 
102 65-20 60 28-10 
100 55-20 68 22-2 
100 105 50 7 
90 125 
122 105-25 | 
_ All the previous experiments were repeated with the rods at 
right angles to the meridian, but no noticeable difference in 
results was obtained. The conclusions are as follows: 
