Helmholtz resonators - Instrument's card

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Helmholtz resonators

Dating

7 April 1962

The invention of a similar type of acoustic resonant cavity (ie based on the physical phenomenon of resonance regarding the elastic waves in gases) is due to the physicist Helmholtz in 1860, who studied the sound and its perception. Due to the high selectivity of each cavity in amplifying a specific sound frequency, a set of resonators allows the analysis in the frequency domain of complex sounds (sound spectral analysis). In particular, this set of resonators is sensitive to the frequencies of 680, 470, 340, 260 and 235 Hz.

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Helmholtz resonators

Cataloghi	Nº	Voce
Inv. 2016	637	Helmholtz resonators Provisional numbering!
Inv. 1870	1058	Serie di risuonatori di Helmholtz

Section

Acoustics

Window

Conditions

Complete

Working D

Intact

Diameter	14.0 cm (5.5 in)
Height	16.0 cm (6.3 in)

Materials

Sources

Bernardi G., Apparecchi di fisica, III Edizione, Ditta Prof. Gaetano Bernardi, Tranto, 1931, pag. 27, fig. 5174
Felice M., Elementi di fisica, Ditta G. B. Paravia e Comp., Torino, 1887/90, Vol. 3, pag. 106, fig. 42
Magrini R., Apparecchi per l'insegnamento della fisica, Officine Galileo, Firenze, 1940, pag. 165, fig. H782
Privat Deschanel A., Trattato elementare di fisica, Fratelli Dumolard, Milano, 1890, pag. 735, fig. 663
Tarquini A., Apparecchi di fisica, Antonio Tarquini, Roma, 1928, pag. 65, fig. 375

The additional indications which integrate the items of the conservation's state have the following meaning: (?) = maybe complete; M = maintenance; P = partial; R = restored; D = used for teaching; NC = not checked; X = impossible to verify.

In order to avoid that instruments' cards without the english description text of the device be directly selected, I added a special filter with which only the complete cards are shown in the menu. Anyhow all the partial english instruments' cards (with instrument's dating, dimensions, state of conservation...) can always be seen even if they haven't the english description text. To read this uncomplete cards is sufficient to click, for example, on an instrument's picture or on the word "View" of the table column called "Card" every time they appear in the other pages of this database.