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- Federal Bureau of Investigation Anited States Department of Iustice 936 Raymond-Commerce Building Newark, New Jersey ween DD "a / Federal Bureau of Investigation on AF OE —— Washington, D. Ce © Re: DeSTRUCTION AIRSHIP HINDENBURG Peer Sir: On May 20, 1937 at 6:00 P.M., Commander C. E. Rosendahl, of the Naval Air Stetion at Lakehurst, New Jersey, contacted Special Agent in Charge Devereaux by telephone and advised that a chemist associated with the Pureau of Mines and Explosives who receives conm= pensetion from the Association of Railroads in the eastern part of the United States, had made an examination of the gas valve which had been located by Dr. ludwig Duerf chief Construction Engineer of the German Zeppelin Transport Company, and had determined that the foreign substance present on the valve head was not sulphur or any active acid. The chemist advised Commander Rosendahl that to really determine what composed the deposited substance, a detailed, minute examination would have to be made, and suggested that the examinati made by the Bureau of Standards at Fee CORDTD Ga ° £190 7 1G Commander Rosendehl advised that ;the committee was taking. steps in the immediate future to have this suggested exariination aad’! UN by the Bureau of Standards at tashington, iD. Ce VAY BG iL37P YU, oP ee oe eran ees * hy 1 i . { He further advised that the German ‘ommiseion ig now 9) be the opinion that the deposit appearing upén the valve hagetdy ~ 4 hy f sibly have originated from a fire extinguisher which wa Ee re the aft portion of the ship, and that it was eithes a depos from . {v the burned rubber or the discharged fluid of thiy fir a wishere = r : For the assistance of the Bureau there is transmitted with this letter a photostatic copy of the diagrax of the Hindenburg ‘ waich is marked 12-129, and a photostatic copy of the diagram of the tory & { J } ey a i ‘QOPTRS DESTROYED | 30 ui 4G 1964 ie caren ene coed eee a er [2 ee nS ee