This is a "single-braced triangular girder."  It measures 16 in. long x 8 in. x 8 in. x 5-1/2 in. or 41 cm long x 20 cm x 20 cm x 14 cm.  LZ. 85 is generally believed to have been brought down by anti-aircraft fire from H.M.S. Agamemnon on May 5th, 1916.  The attached tag states that it came down due to "French anti-aircraft fire." In February, 1917, the Admiralty printed 700 editions of a "Secret" intelligence report with numerous photos taken by the R.N.A.S. of the wreckage of eight German "Super Zeppelins" - L15, L31, L32, L33, L34, LZ 77, LZ 85, and SL 11.  A page from that report is shown below showing this specific type of girder as used on LZ 85 (Fig. 34).  From the Michael Baldwin Collection.