For centuries people tried whatever possible to improve hearing. In the 16th century Italian philosopher Gerolamo Cardano suggested using a metal pot, which one ought to place in front of his ear and start talking.
For centuries people tried whatever possible to improve hearing. In the 16th century Italian philosopher Gerolamo Cardano suggested using a metal pot, which one ought to place in front of his ear and start talking. This method was used until 19th century. In 1810 Johann Maelzel invented his personal version of a hearing device with tubes intended for Ludwig van Beethoven.
