Albatros D.V Lower Wing Spar

This is the inboard end of the main spar of the lower port wing of an Albatros D.V. where it slides into the fuselage stub wing's fitting.  A single bolt then slides through the two fittings to keep them together.  A compression bar wraps around the spar.  The blueprint is a drawing by the French STAé  of a captured D.Va's. spar and compression bar.