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<title> SUMMARY </title>The wire eyepiece micrometer made by Jacob Lusverg (1636-1689) dated 1677, was found in the seminary of Treviso in 1991. An original contribution on Jacob Lusverg's biography is given from unpublished documents. In this paper the structure and the operating use of the micrometer is described. The micrometer was restored in the laboratory of the Museum of Phisics in Bologna by A. Grilli. It is also described the small telescope, whose objective glass is signed Domenico Selva. This item was recently used by M. Toulmonde, in the Observatory of Paris, in order to repeat a series of historical measures of the Sun's diameter, made by A. Azout in the XVII Century.

Affiliations: 1: Università di Bologna


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