Philosophical hammer - Instrument's card

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Philosophical hammer

Dating

November 1880

A curious tool in its extreme simplicity used to hear the sound produced by a liquid that he drips or falls on a surface in conditions of low pressure (around the millimetre of mercury). With surprise it was possible to notice that the sound was the same produced by a hammer in striking a metal surface.

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Philosophical hammer

Cataloghi	Nº	Voce
Inv. 2016	623	Philosophical hammer Provisional numbering!
Inv. 1925a	279	Martello sonante
Inv. 1870	476	Martello sonante

Section

Acoustics

Window

Conditions

Complete

Working

Intact

Diameter	4.0 cm (1.6 in)
Height	28.0 cm (11 in)

Materials

glass, water

Sources

Daguin P. A., Cours de physique élémentaire avec les applications a la météorologie , E. Privat, Toulouse, 1863, pag. 47, fig. 49
Jamin J., Piccolo trattato di fisica, B. Pellerano, Napoli, 1880, pag. 3, fig. 4
Milani G., Corso elementare di fisica e meteorologia, Editori della biblioteca utile, Milano, 1869, Vol. 1, pag. 86, fig. 34
Resti E., Catalogo generale di apparecchi per l'insegnamento della fisica, Ditta Emilio Resti di Franco Brambilla, Pubblicazi, Milano, 1930, pag. 34, fig. 161
Tarquini A., Apparecchi di fisica, Antonio Tarquini, Roma, 1928, pag. 21, fig. 90

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.