REPRODUCTION OF ARTICULATE SPEECH AND OTHER SOUNDS. THE NATIONAL SYSTEM OF PURIFYING WATER BY FILTRATION PRECIPITATION AND AERATION. SECTION OF RECORDING DIAPHRAGM. Fig. 5. SECTION OF REPRODUCING DIAPHRAGM. FILTER PLANT OF NATIONAL WATER PURIFYING COMPANY AT CHATTANOOGA TENN., scientific american, 1888-07-14

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REPRODUCTION OF ARTICULATE SPEECH AND OTHER SOUNDS. THE NATIONAL SYSTEM OF PURIFYING WATER BY FILTRATION PRECIPITATION AND AERATION. SECTION OF RECORDING DIAPHRAGM. Fig. 5. SECTION OF REPRODUCING DIAPHRAGM. FILTER PLANT OF NATIONAL WATER PURIFYING COMPANY AT CHATTANOOGA TENN., scientific american, 1888-07-14

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