[PrevPage] [Next] [INDEX ]  Volume 1   23 Mar. 1876    Page 69  [Source] [ NOTES ]
    Sponge
  1. Let a number of copper (c) and zinc (z) plates be arranged upon a sounding-board (SS') as in Fig 2 with moistened spong or cloth between them.
    Such a battery would surely be exquisitely sensitive to sounds. The vibration of the sounding-boards would certainly materially affect the current; occasioning very strong undulations of electicity upon the line.

    Liquid Transmitter

  2. Willie Hubbard + I made some experiments this evening to test the effect of enlarging the metallic surface in contact with the water. A piece of platinum foil (P) Fig 3 5/8th of an inch in breadth was attached to the cork C and vibrated in the water. The sound was certainly loud but not so loud as in our original experiment (page 40).

  3. The platinum foil was placed slightly on one end so
[PrevPage] [Next] [INDEX ]  Volume 1   23 Mar. 1876    Page 69  [Source] [ NOTES ]