| Lightning electric device |
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| Dating | 1892 |  |
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| This is a simple device to experiment with the electric sparks, which are little lightning. From the electrostatic point of view the phenomenon used and shown is the so-called tips' effect, in correspondence of which the intensification of the electrostatic field take place. Approaching the tip to an electrostatic machine's positive conductor, an electric spark will appear between the conductor and the tip, even if we move the tip a bit. Furthermore, in the dark, we would see puffs of light, "the exact image of what it is produced some time at the tip of a lightning rod when there is a strong hurricane" (see source cited). The brass bar is telescopic and it can reach the maximum elongation of 165 cm. |
| Web page | Lightning electric device |
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| Cataloghi | Nº | Voce |
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| Inv. 2016 | 473 | Lightning electric device Provisional numbering! |
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| Inv. 1925a | 357 | Apparato per il fulmine |
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| Inv. 1870 | 612 | Apparato per il fulmine |
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| Section | Electrostatics |
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| Window | Non esposto |
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| Conditions | | | Diameter | 2.0 cm (0.8 in) |
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| Height | 73.0 cm (28.7 in) |
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| Materials | brass, glass |
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| Sources |
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Privat Deschanel A., Trattato elementare di fisica, Fratelli Dumolard, Milano, 1890, pag. 531, fig. 457
Privat Deschanel A. - Pichot, Trattato elementare di fisica, Fratelli Dumolard, Milano, 1871, pag. 475, fig. 434
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| 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. |