| 10 0·062 sec. |
| 11 |
| 12 0·062 sec. | 13 0·070 sec. |
On increasing the height of fall of a rough sphere to 60 cm., we obtain a higher crater which closes and forms a bubble, exactly as when we increased the height of fall of a liquid drop. The process as viewed from above the surface is shown in Series VII. The first figure of this series shows very well how completely the liquid is driven away from the surface of the sphere the first moment of contact. The subsequent crater and bubble are of exquisite delicacy. This bubble, though it closes completely as in the last figure, is doomed to almost immediate destruction. For we see, on looking below the surface, that the proceedings there are of the same kind as in the case of the lower fall already described, and result in the formation of an upward-directed jet.
SERIES VII
Rough sphere falling 60 cm. Scale 3/4.
| 1 T = 0 |
| 2 0·003 sec. |
| 3 0·017 sec. | 4 0·017 sec. |