Photographing the Vibrations of the Voice

C. Cuttriss
1881 Scientific American  
this is not essential. This arrangement will keep the terminal plate charged to the potential due to the chemical relations and number of cells in the battery. If the battery be placed
doi:10.1038/scientificamerican06181881-389a fatcat:x5bwawyh6fblhcp7f5dypsvckq