. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 200 THE SPLASH OF A DROP AND ALLIED PHENOMENA. flash tliat tlie splasli is viewed. The illumination is greatly helped by surrounding- the i)lace where the splash and flash are produced by a white cardboard inclosure, seen in fig. 2, from whose walls the light is diflused. It will be observed that the time at which the spark is made will depend on the distance that the sphere has to fall before striking the plate D, for the subsequent action
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. 200 THE SPLASH OF A DROP AND ALLIED PHENOMENA. flash tliat tlie splasli is viewed. The illumination is greatly helped by surrounding- the i)lace where the splash and flash are produced by a white cardboard inclosure, seen in fig. 2, from whose walls the light is diflused. It will be observed that the time at which the spark is made will depend on the distance that the sphere has to fall before striking the plate D, for the subsequent action of demagnetizing F and pulling the wire L out of the mercury in the cup H is the same on each occasion. The modus operandi is consequently as follows: The observer, sitting in comparative but by no means complete darkness, faces the appa- ratus as it appears in fig. 2, presses down the ends A' B' of the levers first described, so that they are held by the electro-magnet O (fig. 1).. Fig. 2. Electric flash npparatus. Then he ijresses the lever IST P down on the electro-magnet F, sets the timing sphere and drop in place, and then, by means of a bridge between two mercury cups, short-circuits and thus cuts off the current of the electro-magnet C This lets ofi' drop and sphere, and produces the flash. The stage of the phenomenon that is thus revealed having been sufficiently studied by repetition of the experiment as often as may be necessary, he lowers the plate D a fraction of an inch, and thus obtains a later stage. Not only is any desired stage of the phe-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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