NOTICE:The english translation of the database is an important occasion to let the A. M. Maria Travarsi Physics collection be better known. The translation is a work in progress that can't be realized in a few time: the hardest work is the translation of the texts in which each instrument is shortly explained. So partial translated cards (read cards in english with all the data, but without the device description text) are always available on the web for all the instruments that appear in the italian version of this database, even if in the pages in which instrument's cards can be selected by name or by 1870 inventory number I added a special filter that lets only the items of the complete cards be shown in each selection menu. That's the reason why the available data in english are different from the one written in the correspondent italian page. The differences are due to the translation of the description texts that are not jet done.