| Amici's prism |
|---|
| Dating | February 1879 |  |
|---|
| The tool can produce the spectrum of the light so that it can be taken on a screen in the same direction of the one of the light rays (direct vision). This is possibile thanks to the so-called Amici's system (also known as Amici's prism), a device built between 1857 and 1860 by Giovanni Battista Amici (1786-1863) to let himself to have an easier observation of the stars' spectra. The Amici's prism inside the tool's brass pipe is made with three Crown glass prisms and two Flint glass prisms alternately disposed one by one. In this optical system the light is dispersed (the light specrum is produced), but with a null total deviation angle (the average direction of the spectrum's colours is the same of this of the light rays which arrive inside the instrument). |
| Web page | Amici's prism |
|---|
| Cataloghi | Nº | Voce |
|---|
|
| Inv. 2016 | 767 | Amici's prism Provisional numbering! |
|---|
| Inv. 1925a | 265 | Prisma a visione diretta su piede d'ottone |
|---|
| Inv. 1870 | 451 | Prisma a visione diretta su piede d'ottone |
|---|
|
| Section | Optics |
|---|
| Window | I |
|---|
| Conditions | | | Large | 12.0 cm (4.7 in) |
|---|
| Width | 11.0 cm (4.3 in) |
|---|
| Height | 35.0 cm (13.8 in) |
|---|
|
|---|
| Materials | brass, lead, different glasses, twine, lacquer, cork, gloss paint |
|---|
| Sources |
|---|
Drigo A., Lezioni di fisica sperimentale e applicata alla medicina e alla biologia, Libreria R. Zannoni, Padova, 1941, pag. 435, fig. 165
Gelcich G., Ottica, Hoepli, Milano, 1895, pag. 194, fig. 94
Murani O., Trattato elementare di fisica compilato ad uso dei licei e degli istituti tecnici, Heopli, Milano, 1906, Vol. 2, pag. 94, fig. 80
|
| 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. |