File:Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II (1900) (14761179776).jpg

Identifier: philtrans04612896 (find matches)
Title: Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II
Year: 1900 (1900s)
Authors: Worthington, A. Cole, R.
Subjects: Proceedings of the Royal Society of London Philosophical Transactions of the Royal Society
Publisher: Royal Society of London

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these limitsthe viscosity does not play an important part in determining the main course of thephenomenon.) Experiments in vacuo. It remained to examine what part was played by the air in the whole transaction.This could only be settled by removing the air. We accordingly made provision forobtaining, by instantaneous illumination, observations of splashes in vacuo. Themethod was simple enough, since, happily, very exact timing was not necessary. Foreye.observations a large, strong * bolt-head was employed, and a 1-inch thickslab of india-rubber closed it air-tight (see fig. 4). This slab was pierced at one sideby a glass tube leading to a Fleuss pump, and centrally by a short thick conical pieceof soft iron, which served as the prolongation of the core of a straight electro-magnetwhich could be laid on the top. A pad of folded, fine woven, copper wire-gauze^^prevented the bottom of the vessel being broken by the impact. Fig. 4. To Fieuss pump\ I.R.sbab^ .\ Sphere with^ soft iron piu^.
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CopperQdune The nickelled and polished steel spheres were at first employed, but these retainedso much of their magnetism that the timing was very uncertain, and they were after- ^ We have found a pad of this material very convenient and efficient in all our experiments. VOL. CXCIV.—A. 2 C 194 MESSRS. A. M. WORTHINGTON AND R. S. COLE wards discarded for spheres of marble and serpentine, into which a deep hole wasdrilled, and into this a soft iron plug inserted. After each splash the air had to bere-admitted, the electro-magnet removed, and the vessel opened and the sphere fishedout by means of a long, clean, bar-magnet. The exhaustion was always pushed to within 2 or 3 millims. of a perfect vacuum,the vapour only of the liquid being left. The first observations were made in broaddaylight, with a highly polished nickel sphere (size 1), dusted and u.ndusted, aaid alsowith a rough marble sphere, 2 54 millims. in diameter. The observations werealternated by others, in which all conditio

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