Paper Membrane
   The 1889 Koenig catalogue lists this as catalogue number 118, "circular paper membrane, 30 cm in diameter  .. 11 francs"; the Queen catalogue for the same year lists it at $2.00. The membrane is designed to show Chladni figures. The source of the sound is an elliptical bell that is set in motion by drawing a rosined violin bow across its edge. Thin rubber can also be used as a membrane.

   The apparatus is in the collection at Amherst College. On the right hand side can be seen the ACPL (Amherst College Physics Laboratory) number that I remember so well from my undergraduate days in the later nineteen fifties. Just above this is Koenig's name stamp.

Return to Koenig Home Page | Return to Home Page