the needle was positive, the drop was on the side of the needle 
nearest to the orifice, and when negative, on the side farther 
from the orifice. These drops were photographed and are shown 
| to the Air by a Steam Jet 133 
in fig. 4; the position is so definite that by noting where the 
| 
y 
: 
y 
Fig. 4, The needle has a negative charge when the drop is towards the jet, and 
a positive charge when away from the jet, the positions with reference to 
the jet being shown at B and C, fig. 2. 
drop is seen, the charge upon the needle may be inferred. The 
cause of the position assumed by the drop is probably in some 
way related to the eddy currents present in the steam after striking 
an obstacle, 
