Helmholtz's double siren - Instrument's card

	Virtual Museum - Traversi Museum
	Instrument's card

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Helmholtz's double siren

Dating

1868 - 1874

Maker

Tecnomasio

Web page

Helmholtz's double siren

Cataloghi	Nº	Voce
Inv. 2016	610	Helmholtz's double siren Provisional numbering!
Inv. 1925a	103	Sirena doppia di Helmotz
Inv. 1870	152	Sirena doppia di Helmotz

Section

Acoustics

Window

Conditions

Incomplete

Working P

Damaged

Large	24.0 cm (9.4 in)
Width	13.0 cm (5.1 in)
Height	40.0 cm (15.7 in)

Materials

brass, iron, wood, lacquer

Sources

Battelli A. - Cardani C., Trattato di fisica sperimentale ad uso delle università, Francesco Vallardi, Milano, 1923, Vol. 2, pag. 100, fig. 66
Pinto L., Trattato elementare di fisica compilato ad uso dei licei, Cav. Antonio Moreno editore, Napoli, 1892, pag. 238, fig. 273
Privat Deschanel A., Trattato elementare di fisica, Fratelli Dumolard, Milano, 1890, pag. 711, fig. 635
Privat Deschanel A. - Pichot, Trattato elementare di fisica, Fratelli Dumolard, Milano, 1871, pag. 618, fig. 591
Resti E., Catalogo generale di apparecchi per l'insegnamento della fisica, Ditta Emilio Resti di Franco Brambilla, Pubblicazi, Milano, 1930, pag. 40, fig. 197

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.