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10

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11
         Monday May 15-1882.
through bag F, and jet H, over to the [[strike]] pho [[/strike]] moving phonogram, and the sounds were heard in the hearing tube E.
  The sounds obtained with this apparatus [[strike]] were [[/strike]] could not be distinguished from those obtained with the friction reproducing arrangement.
 My idea of the action of this apparatus is as follows:
   The irregularities of the phonogram passing the end of the jet cause a varying amount of obstruction to the  escape of the air, and consequently a varying pressure in the bag F, which is distincted by the pressure of the air. The vibrations of F, cause a corresponding disturbance of the air in tube B, and the sounds appear in the hearing tube E. which is connected with it.
  The diameter of the base of the jet used was about 0.75 mm, and the point was placed as close to the phonogram as possible without touching it.
  (For very similar experiments and apparatus, see Vol. XIII, of Lab Rough Notes, p.p. 71-73-79 and Vol. II, of these Notes p.p. 69- 71 [[short horizontal line]])
  By using a more dense gas than air, or heavy liquids, (mercury for instance) I think better effects will be obtained by the method of reproducing described upon p. 9; as practically the the [[strikeout]] power [[/strikeout]] energy required to produce the sounds is derived from the rotating phonogram, and an unlimited supply can be obtained.
   Noted by S.T. May 15-1882 [[short horizontal line]]