Christ and the Virgin Diptych Christ and the Virgin Diptych The Christ and the Virgin Diptych consisted of two small oil on oak panel paintings by the Early Netherlandish painter Dirk Bouts (also called Dieric Bouts) completed c. 1470–75. Originally they formed the wings of a hinged devotional diptych. The original autograph diptych is lost, although numerous versions of generally rather poor quality survive including a near identical diptych in the Louvre and a similar diptych in Toronto. Other versions of each panel survive. The best versions of the "Mater Dolorosa" are in the Art Institute of Chicago and in the Weissberger collection at Madrid.
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