» Quincke Apparatus (0553)

Immagini

DESCRIPTION

Exhibit 553 is an acoustic interferometer, invented by Georg Hermann Quincke (1834-1924), to demonstrate interferenza between sound waves and to measure their wave lengths.

The device consists of a tube which branches into two semicircular tubes, A of fixed length and B of variable length, with a common entrance C and a common exit D. A generator of sound waves is placed at C and a receiver (a cone and a microphone) is placed at D. The tubes are held upright against a wood panel mounted on two feet.

The sound waves from a source (generally a high-frequency tuning fork of around 1000 Hz) enter at C and fork into tubes A and B and then reunite at D. One notes that the microphone at D detects sound intensity with maxima and minima in correspondence with the length of the variable section.

ISCRIZIONI

Inciso sull'etichetta in metallo:
Vereinigte Fabriken
wissenschaftlicher Apparate
UHLIG & Co.
Hamburg 1. Raboisen 99

BIBLIOGRAPHY

[1] Antonio Caforio, Aldo Ferilli, "PHYSICA", VOL 2, LE MONNIER, 2000. §7, pag. 73.

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