| 1 0·055 sec. |
From a splash into Petroleum
24·5 cm. fall.
| 2 0·060 sec. | 3 0·064 sec. |
From a splash into Petroleum
32 cm. fall.
| 4 0·070 sec. | 5 0·082 sec. |
The reader's attention is directed to the remarkably deep furrows which characterize the whole sheath in Fig. 3 and the left-hand (smooth splash) part in Fig. 5. About these furrows we shall have something to say later.
A better idea of the extreme thinness of the enveloping sheath is obtained when the illumination is from behind as in Series X, in which the sphere was of highly polished serpentine stone 2·57 cm. (or just over 1 inch) in diameter, the fall being 14 cm. (or not quite 6 inches).