. Carnegie Institution of Washington publication. . FiG. 9.—Nodal figure from a diaphragm with free edge. Fio. 10.—Circular distribution of light from a diaphragm with fixed edge. tion by a gramophone record, the box gave forth only a very weak tone with occasional rattling. The edges of the diaphragm could be seen to be in strong vibration; this occasionally became so strong that the glass struck the metal. When water was placed round the edge, the result was not greatly altered, as the water was quickly blown awaJ^ As soon, however, as vaseUne was appHed, the sound came out strongly and clea
. Carnegie Institution of Washington publication. . FiG. 9.—Nodal figure from a diaphragm with free edge. Fio. 10.—Circular distribution of light from a diaphragm with fixed edge. tion by a gramophone record, the box gave forth only a very weak tone with occasional rattling. The edges of the diaphragm could be seen to be in strong vibration; this occasionally became so strong that the glass struck the metal. When water was placed round the edge, the result was not greatly altered, as the water was quickly blown awaJ^ As soon, however, as vaseUne was appHed, the sound came out strongly and clearly. We can thus conclude that the fixation at the edge has at least two pur- poses: (1) To produce an air-tight closure around the diaphragm, and (2) to hinder the edge from striking against the metal. A third purpose of the fixation appears in the following experiments: The light from an arc lamp was allowed to fall upon the diaphragm of a reproducer; the reflection was caught upon a white screen. When the diaphragm had been so inserted in the reproducer that its surface was flat, the reflection appeared as a white 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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