~ 
204 E. L. Carney—Effect of Vibrations wpon EHlectro-magnets. 
magnetizing helix. We shall term the currents which were 
stantly. On exciting longitudinal vibrations, it was found that 
With steel the results obtained were constant, while with iron 
they were variable. It was found impossible to excite more 
than one tertiary current. 
magnetizing circuit positive throughout these experiments. 
On the iron rod the magnetizing helix was forty centimeters 
from the center; on the steel rod only fifteen. 
Tass I, 
Tron rod. Steel rod. 
} db 
Current made. a by Current made. Slag ld a y 
om a . sila 
55 35 30 10 
50 45 30 10 
70 45 30 10 
55 44 
oe 40 
60 38 
some cases there was more than one tertiary current, which 
was apparently due to the feebleness of the first vibration, as the 
such was the case. However, this could not have been the 
e tertiary current appeared when 
the vibration was all that could have been Suchet for. In the 
