Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II
Impact with a Liquid Surface Studied by the Aid of Instantaneous Photography. Paper II
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DOI：
10.1098/rsta.1900.0016
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通讯作者：
A. M. Worthington;R. S. Cole
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作者：
A. M. Worthington;R. S. Cole
在以前的一篇论文中（《哲学学报》，1897年，第189卷，第137页），我们已经提请注意这样一个事实，即由于一个粗糙的球体落入液体中的冲击而在液体中产生的扰动，与光滑球体进入后产生的扰动有着非常显著的不同。在本文中，我们描述了进一步的实验，目的是确定这种差异的原因，并给出得出的结论。首先，对水线以下的扰动液体进行即时拍照似乎是可取的。这些很容易通过让飞溅发生在一个近似平行的侧面薄玻璃容器（倒置的时钟阴影）从后面照明。当液体表面不受干扰时，它大约与照相机镜头的中间水平，当在水下时，它被聚焦为球体。从所附的剖面图（图1）可以充分理解光学装置的总体布置。定时照明的方法是已经描述过的（loc.前引书).
In a previous paper (‘Philosophical Transactions,’ A, 1897, vol. 189, p. 137) we have drawn attention to the fact that the disturbance set up in a liquid by the impact of a rough sphere falling into it, differs in a very remarkable manner from that which follows the entry of a smooth sphere. In the present paper we describe further experiments, made with the object of ascertaining the reason of this difference, and give the conclusions reached. It appeared desirable, in the first place, to take instantaneous photographs of the disturbed liquid below the water-line. These were easily obtained by letting the splash take place in an approximately parallel-sided thin glass vessel (an inverted clock-shade) illuminated from behind. The liquid surface when undisturbed was about level with the middle of the camera-lens, which was focussed for the sphere when under water. The general arrangement of the optical apparatus will be sufficiently understood from the accompanying cut (fig. 1). The method of timing the illumination was that already described ( loc. cit. ).