. Carnegie Institution of Washington publication. CHAPTER III. ON ACOUSTIC PRESSURES AND ACOUSTIC DILATATIONS, CHIEFLY IN RESERVOIRS. 13. Introductory. Apparatus.—On a number of occasions heretofore,* I have endeavored to use the interferometer for the measurement of Mayer and Dvorak's f phenomenon, but though the experiments seemed to be well designed and were made with care they invariably resulted in failures. The present method, however, has been successful and has led to a variety of sur- prising results, even if the term acoustic pressure is not directly applicable. The apparatus is show
. Carnegie Institution of Washington publication. CHAPTER III. ON ACOUSTIC PRESSURES AND ACOUSTIC DILATATIONS, CHIEFLY IN RESERVOIRS. 13. Introductory. Apparatus.—On a number of occasions heretofore,* I have endeavored to use the interferometer for the measurement of Mayer and Dvorak's f phenomenon, but though the experiments seemed to be well designed and were made with care they invariably resulted in failures. The present method, however, has been successful and has led to a variety of sur- prising results, even if the term acoustic pressure is not directly applicable. The apparatus is shown in figure 14, where B is a mercury manometer described in Chapter I, the displacements being read off by the component rays L, L' of the vertical interferometer. The mercury of the U -tube is shown at mnm', above which are the glass plates g, g', the former being hermetically sealed, the latter loose, so that the air has free access. The closed air-chamber R, above m, receives the air-waves from the plate of the telephone T, by means of the quill-tubes t, hermetically sealed into the mouth-piece of the telephone, and t' sealed into the manometer. Finally, t" is a branch tube ending in a small stop-cock C, or similar device at one end, while the other communicates with it'. Flexible-rubber tube connectors may be used at pleasure, so long as the space bounded by the outer face of the telephone plate, the mercury surface m,. 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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