Portrait Diptych of Dürer's Parents Portrait Diptych of Dürer's Parents Portrait Diptych of Dürer's Parents (or Dürer's Parents with Rosaries) is the collective name for two late-15th century portrait panels by the German painter and printmaker Albrecht Dürer. They show the artist's parents, Barbara Holper (c. 1451–1514) and Albrecht Dürer the Elder (c. 1427–1502), when she was around 39 and he was 63 years. The portraits are unflinching records of the physical and emotional effects of ageing. The Dürer family was close and Dürer may have intended the panels either to display his skill to his parents or as keepsakes while he travelled soon after
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