Fluorescent screen for X-ray - Instrument's card

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Fluorescent screen for X-ray

Dating

8 March 1940

A cardboard mounted on a wooden frame and coated in barium platinocyanide is a particular fluorescent screen, that is, with a substance that emits induced luminescence in the visible region of the electromagnetic waves' spectrum. This type of screen is related to the discovery of X-rays in 1895 by Wilhelm Roentgen (1845-1923) while he was experimenting with Crookes tubes. The screen brightly lights up by ultraviolet radiation, in particular the X-ray radiation emitted by the Crookes tubes. By interposing his hand between the tube and the screen, the shadow of its bones appeared to Roentgen. Clearly the screen acts as a detector of the X-ray emission.

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Fluorescent screen for X-ray

Cataloghi	Nº	Voce
Inv. 2016	790	Fluorescent screen for X-ray Provisional numbering!
Inv. 1870	961	Schermo fluorescente per raggi X

Section

Optics

Window

Non esposto

Conditions

Complete

Working NC

Intact

Large	30.0 cm (11.8 in)
Width	2.0 cm (0.8 in)
Height	24.0 cm (9.4 in)

Materials

Sources

Bernardi G., Apparecchi di fisica, III Edizione, Ditta Prof. Gaetano Bernardi, Tranto, 1931, pag. 67, fig. 5443
Magrini R., Apparecchi per l'insegnamento della fisica, Officine Galileo, Firenze, 1940, pag. 331, fig. N1248
Resti E., Catalogo generale di apparecchi per l'insegnamento della fisica, Ditta Emilio Resti di Franco Brambilla, Pubblicazi, Milano, 1930, pag. 104, fig. 508

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.