Physical description

Apparatus to analyse the harmonic upper partials of c. Apparatus consists of 8 Helmhotz resonators (one missing) tuned to the upper harmonics of c. Each of the 8 resonators is connected with a manometric flame. All the manometric flames are observed by means of the rotating mirror. When a sound strikes the apparatus containing a tone to which one of the resonators is tuned, the image of the corresponding manometric flame is resolved by the rotating mirror into a series of separate images. The apparatus corresponds to a modern fourier spectrum analyser.