Rough sphere falling 140 cm. into water. Scale 2/3.
| 1 0·006 sec. | 2 0·008 sec. |
| 3 0·015 sec. | 4 0·021 sec. |
| 5 0·038 sec. |
The segmentation of the air column appears to be independent of the jet; but some photographs, such as Fig. 7, show the jet striking the side and breaking into the surrounding liquid with a great accompaniment of "air-dust."
SERIES XVII—(continued)
| 6 0·043 sec. | 7 0·052 sec. |
N.B.—Each of these figures is made up from two photographs; one of the upper and one of the lower portion taken from different splashes, but with the same "timing."
The reader will observe that after division of the air-tube has taken place, say from Fig. 9 onwards, the water entering the jet at the top and coming out again at the bottom must circulate as in a vortex ring, part of the core of which is filled with the air surrounding the jet.