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The sphere of activity of Biagio Burlini, an optician and instrument-maker working in Venice around the middle of the eighteenth century, is here pointed out. A research in the Archivio Patriarcale of Venice allowed to find the year of his birth (1709) and his death (13.1.1771). A survey of signed microscopes and telescopes now in various public and private collections contributes to a better knowledge of optical instrument-makers in that century.