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Explication texts of the instruments
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Section Items: 20

Brass square by F. Manfredotti
Before 1818 (XVIII cent.)
The tool, signed F. Manfredotti, was used in horizontal position and with its compass (the needle has gone lost) to get measures of angles for the cartographic reliefs. Besides it could be employed as proportion compass: infact its arms are endowed with the usual nicks to quickly perform specific calculations. The measures are in "feet" and precisely in the "Piede di Venetia" [Venician foot] and in the "Piede di Parigi" [Parisian foot].
Brass graphometer by Roussellot
Before 1818 (XVIII cent.)
The tool, signed F. Roussellot - Paris, is indeed of great beauty and with a well done refinement of its brass parts. It was used in horizontal position and with its compass (still working!) to get measures of angles for the cartographic reliefs (not only with a military purpose, but also for having maps of the fields).
Proportion compasses by Blondeau
Before 1818 (XVII cent.)
Text will be translated as soon as possible.
Praetorian table in brass
Before 1818 (1677)
To easly have a scale map of a certain zone for military purpose or just to measure a field in the past was used the Pretorian table (the support has gone lost). In fact with such an instrument the operation was fast and with a relative great precision. The tool is incomplete, because a brass bar fixed in the hole near one of the vertexes has gone lost. This piece (the graphometer) was used at the same time to draw lines on a paper sheet placed on the table and to work as goniometer.
Series of geometric solids in wood
Before 1818
Text will be translated as soon as possible.
Brass graduated quadrant
Before 1818 (1677)
Text will be translated as soon as possible.
Brass ruler for drawing parallel lines
Before 1818 (1677)
Text will be translated as soon as possible.
Nonius in wood
1868 - 1874
Text will be translated as soon as possible.
Tool for ballistics studies
Before 1818 (1677)
Text will be translated as soon as possible.
Measure in Roman spans
Before 1818 (1677)
Text will be translated as soon as possible.
Calipers for measuring the diameter of balls
Before 1818 (1677)
A very simple but quite important tool used in ballistics to measure the diameter of a cannon ball and to verify its compatibility with the piece of artillery. If in fact the dimensional tolerance of the cannon ball is insufficient, the thermal expansion can embed the bullet with the risk of explosion of the gun. On the contrary, if the ball is too small, the cannon throw is weak.
Proportion compasses by Lusverg
1677
Text will be translated as soon as possible.
Compasses by Steffani
Before 1818
Text will be translated as soon as possible.
Two Roman-foot measure in brass
Before 1818 (XVII cent.)
This ancient tool can be seen as the equivalent of our modern well-known double decimeter. It was used to measure linees in the maps. The measure units are the Roman Palm and the Roman Foot: infact on the instrument is written on one side "Tre palmi romani" [Three Roman palms] and on the other side "Due piedi romani" [Two Roman feet].
Nonius in boxwood
1868 - 1874
Text will be translated as soon as possible.
Metre-rule in wood with metal heads
Before 1818
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Nonius in brass
1829 - 1830
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Five feet measure in wood
1868 - 1874
Text will be translated as soon as possible.
Ebony pantograph
Before 1818
Text will be translated as soon as possible.
Wooden cone for conic sections
1891
Text will be translated as soon as possible.