X-ray computed tomography to explore the construction technique of Coronelli's three-and-a-half-foot globes.

Morigi M.P., Albertin F., Bettuzzi M., Brancaccio R., Casali F.

VI - Fisica applicata, acceleratori e beni culturali
GSSI Ex ISEF - Aula A - Mercoledì 25 h 10:00 - 13:00
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The Franciscan Vincenzo Coronelli (Venice, 1650--1718) was one of the most famous creators of globes and maps in the late seventeenth century. He manufactured a large number of terrestrial and celestial globes of different sizes. Particularly famous are those made in 1683 for Louis XIV, having a diameter of about 4 meters, which aroused the astonishment and admiration of the King. Starting from these French globes, Coronelli began the production of a series of printed reductions, including globes with a diameter of three and half feet (about 106 cm). The first pair of this series of globes was donated to the Serenissima Republic of Venice in 1689 and is currently part of the Marciana National Library collection in Venice. Last year a complex project of scientific analyses and restoration of the celestial globe started. To evaluate the conservation state of the globe and to better investigate the construction technique of this unique work of art, an X-ray tomographic analysis was performed on-site by means of a portable and versatile CT system developed by our research group. In the contribution, we will present the results of the tomographic investigation, comparing the construction technique of this first three-and-half-foot globe with a subsequent celestial globe of the same size, currently located in the Municipal Library of Faenza.

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