An example of the use of the tonograph is provided by Cagnazzi himself. The syllables of each word and each sentence of a text to are pronounced slowly enough, so as to imitate the voice with the device. Once the sound of the voice seems closest to the human voice of the syllable, the corresponding value on the scale is transcribed below the syllable. At a lower level, the number of bellows pressures carried out for each word is also added. The "measurement" of the voice requires a lot of diligence and a certain number of attempts before reaching a precise measurement.