SELVA, Lorenzo (d. 1799). Sei Dialoghi Ottici Teorico-Pratici, Venice: Simone Occhi, 1787, 4°, FIRST EDITION, 4 folding engraved plates of telescopes and their parts, woodcut initials and ornaments, errata leaf at end (title repaired on verso and tipped onto front blank, a2 slightly damaged at inner margin, with neatly-repaired tear in blank area, and an unrepaired tear at lower margin), 19th-century vellum-backed patterned boards (inner hinges split) [Riccardi I(2) 436.4: "ha in vista di render noti, in modo affatto popolare ed in forma di dialogo, gl'importanti perfezionamenti da lui immaginati nella construzione degli strumenti ottici"]