Cross vacuum tube set - Instrument's card

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Cross vacuum tube set

Dating

8 March 1940

The electrical discharge in the vacuum tubes assumes special shapes depending on the level of the gas pressure present inside. The so-called scale of Cross is a set of vacuum tubes (usually 6) at different pressure which highlight the most important phases of the behavior of the gases subjected to a voltage difference sufficiently high to produce the conduction into the gas.

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Cross vacuum tube set

Cataloghi	Nº	Voce
Inv. 2016	496	Cross vacuum tube set Provisional numbering!
Inv. 1870	959	Scala di Cross di 6 tubi (lunghezza cm 50)

Section

Electrostatics

Window

Conditions

Complete

Working NC

Intact

Large	65.0 cm (25.6 in)
Width	11.0 cm (4.3 in)
Height	59.0 cm (23.2 in)

Materials

Sources

Bernardi G., Apparecchi di fisica, III Edizione, Ditta Prof. Gaetano Bernardi, Tranto, 1931, pag. 65, fig. 5467
Magrini R., Apparecchi per l'insegnamento della fisica, Officine Galileo, Firenze, 1940, pag. 323, fig. N1229
Martelli V., Apparecchi per l'insegnamento della fisica, Soc. Italiana Apparecchi scientifici, Milano, 1956, pag. 40, fig. 785
Tarquini A., Apparecchi di fisica, Antonio Tarquini, Roma, 1928, pag. 148, fig. 30924

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.