According to the inventories of the Museo di Fisica e Storia Naturale, this barometer was invented by Giovanni Battista Amici and made by Galgano Gori. It is enclosed in a brass tube fitted with a tripod. The sliding barometric scale is integral with a cursor to be aligned with the lower mercury level. The readings are taken by means of a vernier. This instrument, which allows the determination of very low pressure values, was used for altitude measurements during mountain-climbing. There is also a mercury thermometer with a centigrade scale.