String and Slit
   The apparatus at the right is listed  as catalogue number 169 in the 1889 Koenig catalogue as a "string stretched before the slit of a resonance box of variable volume... 26 francs."

   In use, the string is bowed (probably on the right-hand side where it is accessible) and the particular frequency of sound is communicated to the box. I was not able to examine the box to see how its volume can be varied. The box probably acts as a Helmholtz Resonator.

   This apparatus is in the collection of Amherst College in Massachusetts. 

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