Crookes tube with pinwheel - Instrument's card

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Crookes tube with pinwheel

Dating

1898

It is a particular vacuum tube, said Crookes tube (from the name of the inventor in 1874) with inside a pinwheel, which starts to rotate when the tube is made to work by means of a Ruhmkorff induction coil. A similar device allowed to demonstrate that the rays produced inside the tube (i.e. electron beams) have evidently a mass (in other words they have a corpuscular nature) because the mechanical action (impacts) produced by them on the blades of the pinwheel.

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Crookes tube with pinwheel

Cataloghi	Nº	Voce
Inv. 2016	481	Crookes tube with pinwheel Provisional numbering!
Inv. 1925a	386	Tubo di Geissler con mulinello interno
Inv. 1870	657	Tubo di Geissler con mulinello interno

Section

Electrostatics

Window

Conditions

Complete

Working NC

Intact

Large	23.0 cm (9.1 in)
Width	7.0 cm (2.8 in)
Height	13.0 cm (5.1 in)

Materials

Sources

Bernardi G., Apparecchi di fisica, III Edizione, Ditta Prof. Gaetano Bernardi, Tranto, 1931, pag. 66, fig. 7445
Magrini R., Apparecchi per l'insegnamento della fisica, Officine Galileo, Firenze, 1940, pag. 324, fig. N1239
Premoli P., Nuovo dizionario illustrato di elettricit&agreve; e magnetismo, Soc. Editrice Sonzogno, Milano, 1904, Vol. 2, pag. 173, fig. 1369
Tarquini A., Apparecchi di fisica, Antonio Tarquini, Roma, 1928, pag. 152, fig. 30976

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.