Ben Franklin's Harmonica Inspired by musical wine glasses he heard played in Europe, Ben Franklin invented a mechanical glass harmonica in 1761. The instrument fell out of favor in the next century and was not heard again until 1982, when German-born glassblower Gerhard Finkenbeiner brought it back to life. Finkenbeiner heard about the instrument while living and working in Paris in the 1950s. Using original plans and drawings, he reinvented the modern glass harmonica.
All materials have a natural frequency of vibration.
Some sounds are easily interpreted when they reach your ear. Explore the world of sound with hearing and other senses. One student is the observer or subject, the other student the assistant. Remove the blindfolds and have the subjects put in ear plugs. Assistants should strike one of the tuning forks and hold it in a glass of water.