. Carnegie Institution of Washington publication. Phonograph cylinder. C L J • ^ I'll i L' ' 'J"™ Smoked paper with tracing ^^^ Far drum Rotator Near drum Fig. 42.—Machine for tracing phonograph records. follows the rise and fall in the bottom of the groove and moves a light " tracing ; The point of this lever records the movement on a long band of smoked paper passing over two drums. The vertical " near drum" is run by a belt from the rotator. The speech curves appear in great magnification on the band of smoked paper. The tracing lever is the critical part
. Carnegie Institution of Washington publication. Phonograph cylinder. C L J • ^ I'll i L' ' 'J"™ Smoked paper with tracing ^^^ Far drum Rotator Near drum Fig. 42.—Machine for tracing phonograph records. follows the rise and fall in the bottom of the groove and moves a light " tracing ; The point of this lever records the movement on a long band of smoked paper passing over two drums. The vertical " near drum" is run by a belt from the rotator. The speech curves appear in great magnification on the band of smoked paper. The tracing lever is the critical part of the apparatus. The sapphire at the end of a steel point follows the speech groove. The fulcrum of the lever to which it is attached is just to the left of it. The long arm is made of selected German straws of unusual Ughtness and rigidity. This is balanced by a weight. The end of the straw arm carries a somewhat modified hinge point. Fig. 43.—Piece of curve obtained by apparatus in figure 42. A piece of curve reduced to three-eighths size from tracings made by this apparatus is given in figure 43; it is from the record of the French poem " Le Roi d';. 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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Keywords: ., bookauthorcarnegie, bookcentury1900, bookdecade1900, bookyear1906
