Geissler tubes - Instrument's card

	Virtual Museum - Traversi Museum
	Instrument's card

Instrument Nº - Query criteria NOTICE

Print the card

Geissler tubes

Dating

1861 - 1862

The Geissler tubes were discharge tubes with inside various gases at reduced pressure. These tubes were created in 1857 by Johann Heinrich Geissler (1814-1876) to study the electric conduction of gases. These devices can be considered an evolution of the so-called electric eggs. With the advance in the art of produce vacuum then the Crooks tubes or cathode ray tubes were realized, a milestone in the path that led to the identification of the negative charge unit, the electron. The inventory of 1925b shows that the pipes were originally 6.

Web page

Geissler tubes

Cataloghi	Nº	Voce
Inv. 2016	455	Geissler tubes Provisional numbering!
Inv. 1925b	116	Tubi di Geisler - Causa richiesta scarico: fuori uso
Inv. 1870	329	Tubi di Geisler
Programmi	75	Alcuni tubi di Geissler

Section

Electrostatics

Window

Conditions

Incomplete

Not working

Damaged

Diameter	3.0 cm (1.2 in)
Height	52.0 cm (20.5 in)

Materials

Sources

Bernardi G., Apparecchi di fisica, III Edizione, Ditta Prof. Gaetano Bernardi, Tranto, 1931, pag. 65, fig. 5467
Felice M., Elementi di fisica, Ditta G. B. Paravia e Comp., Torino, 1887/90, Vol. 2, pag. 284, fig. 115
Magrini R., Apparecchi per l'insegnamento della fisica, Officine Galileo, Firenze, 1940, pag. 323, fig. N1229

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.