Lock Mechanics. – Vivarelli (Giandomenico) Della serratura combinatoria, o sia metodo nuovo di fare le serrature per difendersi dai ladri da chiavi false, FIRST and ONLY EDITION, engraved title vignette, woodcut ornaments, 6 pp. of tables, large folding plate of a combination lock project supplied in facsimile, some foxing, contemporary signature to title, later half calf over patterned boards, soiled, [IT\ICCU\RMRE\001681; not in Poggerdoff], 4to, Ferdinando Pisarri, Bologna, 1750. *** Scarce treatise on a theft-proof combination lock, invented by Master Lorenzo Fondaroli. The tables show possible combinations for each day of the year.