| 7 0·024 sec. |
| 8 0·032 sec. |
| 9 0·042 sec. |
| 10 0·060 sec. |
Now from the depths of the crater there rises with surprising velocity the exquisite jet of Fig. 11, which in obedience to the law of segmentation at once splits up in its upper portion into little drops, while at the same time it gathers volume from below, and rises ultimately as a tall, graceful column to a height which may be even greater than that from which the sphere fell. This is the emergent jet which one sees with the naked eye whenever a sufficiently rough sphere is dropped from a small height into water, but if we are to ascertain how this column originates, we must follow the sphere below the surface of the liquid. The arrangement already described on [p. 69] enables this to be done. We let the sphere fall into clear water contained in a narrow, flat-sided, inverted clock-shade and illuminate this from behind while the camera stands straight in front.
SERIES V
Rough sphere—(continued).
| 11 0·068 sec. | 12 0·076 sec. |
| 13 0·088 sec. | 14 0·100 sec. |