The Watkins Electric Music (WEM) Copicat tape echo creates audible repetitions of sounds by using an endless tape loop. As an electronic effect for rock musicians, it was popular during the 1960s, undergoing a series of modifications in the decades following its creation by Charles Watkins in 1958. It is notable for its successful combination of several distinct areas of audio technology: electronic recording, the use of endless loops, and the use of an intermediate storage medium (tape) to achieve delayed playback.
This Excelsior phonograph is a model based on the Edison phonograph and produced by the Excelsiorwerke Cöln factory in Cologne, Germany, between 1903 and 1906. The original Edison phonograph (invented in 1877 by Thomas Alva Edison) is an iconic piece of historical sound technology that is universally associated with the beginning of sound reproduction in the late nineteenth century. It is based on the direct transfer of the vibration of air, caused by a sound source, onto a writing surface, then its playback. During recording, a stylus cuts a spiraling groove into the cylinder.
The Tefifon is an audio player that uses cartridges containing plastic tape with a vertical arrangement of grooves representing sound. It is a branch of analog audio technology that shares some characteristics with other, better-known devices such as the phonograph or the 8-track tape cartridge. The Tefifon combines these developments in novel ways, introducing features that were lacking in other technologies of the era.