Calipers for measuring the diameter of balls - Instrument's card

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Calipers for measuring the diameter of balls

Dating

Before 1818 (1677)

Maker

Giacomo Lusverg (1636-1689)

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.

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Calipers for measuring the diameter of balls

Cataloghi	Nº	Voce
Inv. 2016	011	Calipers for measuring the diameter of balls Provisional numbering!
Inv. 1925a	11	Compasso in ottone per grossezze
Inv. 1870	12	Compasso in ottone per grossezze
Inv. 1838	20	Compasso per misurare i diametri delle palle
Inv. 1818	24	Compasso per misurare i diametri delle palle

Section

Particular

Window

Conditions

Complete

Working

Intact R

Large	22.0 cm (8.7 in)
Width	1.0 cm (0.4 in)
Height	10.0 cm (3.9 in)

Materials

brass, lacquer

Sources

Clerc A., Fisica popolare, Edoardo Sonzogno, Milano, 1885, pag. 27, fig. 14

Loans

1) Napoleone a Campoformido: armi, diplomazia e società in una regione d'Europa. Villa Manin, dal 12/10/1997 al 11/01/1998, Passariano del Friuli (UD);
2) Genius I. The mission: discover - research - invent. World Cultural Heritage - Völklingen Hütte, dal 13/05/2007 al 30/03/2008, Völklingen/Saarbrüken (D);

Restorations

1) Restauro presso il Laboratorio del restauro dello strumento di interesse storico - Lotto I. Università degli Studi di Urbino, dal 21/09/2009 al 30/09/2010, Urbino;

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.

In order to avoid that instruments' cards without the english description text of the device be directly selected, I added a special filter with which only the complete cards are shown in the menu. Anyhow all the partial english instruments' cards (with instrument's dating, dimensions, state of conservation...) can always be seen even if they haven't the english description text. To read this uncomplete cards is sufficient to click, for example, on an instrument's picture or on the word "View" of the table column called "Card" every time they appear in the other pages of this database.