Astatic galvanometer - Instrument's card

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Astatic galvanometer

Dating

2 February 1903

Tool for the detection of weak currents (galvanometer) and/or for the comparative measure of the currents. The device is equipped with two magnetized needles suspended to a torsion thread and mounted one above the other with opposite poles (astatic system) so the instrument is insensitive to the misleading action of the terrestrial magnetic field typical in the galvanometers with only one magnetized needle. The astatic system was introduced in the galvanometer by Leopold Nobili (1784 - 1835), who built tools of remarkable accuracy and great precision.

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Astatic galvanometer

Cataloghi	Nº	Voce
Inv. 2016	553	Astatic galvanometer Provisional numbering!
Inv. 1925a	402	Galvanometro Nobili
Inv. 1870	681	Galvanometro Nobili

Section

Electrodynamics

Window

Non esposto

Conditions

Complete

Working

Intact

Diameter	20.0 cm (7.9 in)
Height	35.0 cm (13.8 in)

Materials

Sources

Colson R., Traité Élémentaire d'electricité, Gauthier-Villars, Paris, 1885, pag. 109, fig. 52
Desbeaux E., Fisica Moderna, Casa Editrice Sonzogno, Milano, 1892, pag. 524, fig. 440
Despretz C., Traité élémentaire de physique, Méquignon-Marvis, Libraire-éditeur, Paris, 1832, pag. 599, Tav. 11, fig. 324
Drion Ch. - Fernet E., Traité de physique élémentaire, G. Masson éditeur, Paris, 1877, pag. 469, fig. 427
Felice M., Elementi di fisica, Ditta G. B. Paravia e Comp., Torino, 1887/90, Vol. 2, pag. 163, fig. 69
Jamin J., Piccolo trattato di fisica, B. Pellerano, Napoli, 1880, pag. 340, fig. 272
Joubert J., Traité Élémentaire d'electricité, G. Masson Éditeur, Paris, 1889, pag. 317, fig. 260
Milani G., Corso elementare di fisica e meteorologia, Editori della biblioteca utile, Milano, 1869, Vol. 6, pag. 85, fig. 41
Privat Deschanel A., Trattato elementare di fisica, Fratelli Dumolard, Milano, 1890, pag. 562, fig. 492

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.

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