Phonodeik

Description:

Shows the deflection of a light beam which is reflected from a delicate mirror on the diaphragm of a mechanical microphone during oscillation. An "oscilloscope" from the pre-electronic era of candle flames, levers, and ingenuity. Note: For show and tell and historical discussions only.

References, Comments, or Footnotes:

1) Phonodeik. [Wikipedia]

2) The Collection of Antique Physics Instruments at Case Western University.