Symmachi–Nicomachi diptych Symmachi–Nicomachi diptych The Symmachi–Nicomachi diptych is a book-size, Late Antique ivory diptych dating to the late fourth or early fifth century, whose panels depict scenes of ritual pagan religious practices. Both its style and its content reflect a short-lived revival of traditional Roman religion and Classicism at a time when the Roman world was turning towards Christianity and rejecting the Classical tradition. The diptych takes its name from the inscriptions "Nicomachorum" and "Symmachorum", in reference to two prominent Roman Senate families. The diptych remained intact until the nineteenth century. The earliest description of the leaves dates to 1717, when an
Hinged expansion joint joints used in piping systems are restricted to pure angular rotation by its hinges. As a pair, hinged expansion joints will function together to absorb lateral deflection. Advantages of hinged expansion joints are that they are typically compact in size and structurally rigid. Hinged expansion joint A hinged expansion joint is a metallic assembly, that can rotate in a single plane, used to absorb changes resulting from piping thermal expansion or contraction. They include hinges, attached to the expansion joint ends with a pair of pins, which allow angular movement in a single plane, restrain the pressure thrust, and prevent