EXHIBITS (6, 7 and 8) FOR THE PROSECUTION
 

Exhibits 6 ,7 and 8 below are sketches that David Greenglass prepared at the request of the FBI and the prosecution. Notice the date on the bottom right of Exhibit 6 below is June 15, 1950, the day David Greenglass was apprehended and questioned at length by the FBI. In a letter to his attorney and in early statements to the FBI, David never said that he turned over any sketches to Harry Gold or anyone else. 
        However, by the time of the trial he had changed his story. He made the drawings used as exhibits 7 and 8 on the eve of the trial, and testified that all three sketches were replicas of drawings he had passed along to Julius Rosenberg and Harry Gold.
 

The above sketch was claimed by David Greenglass to be a replica of one he passed along to Julius Rosenberg in 1945. Assistant Prosecutor Roy Cohn moved to introduce David Greenglass's cross-section sketch of the atomic bomb into evidence. Defense attorney Emanual Bloch asked to have the sketch impounded "so that it remains secret from the Court, the jury, and counsel."  As a result of this controversial tactic, the sketch remained sealed until lawyers Marshall Perlin and William Kuntsler obtained its release in 1966.
 

the following is from Marshall Perlin's testimony
before Congress in 1982.

The Alleged Secret of the Atom Bomb
          The alleged plan of the atom bomb was said to be contained in two or three pages of testimony of Greenglass and an exhibit which he had drawn while in custody, which purported to be the Nagasaki atomic bomb. The defense, so intimidated and deceived by the representations of the prosecution, asked that the exhibit (Exhibit 8) and the testimony should be sealed and impounded in order to protect the national security. The secret evidence remained impounded until an application was made in behalf of Sobell in 1966 to unseal the evidence, and to make it available to Sobell, his counsel and scientists, subject to some restrictions. 
          Upon receipt of the material, the evidence was shown to leading atomic scientists to render their opinion as to the meaning or worth of the testimony and the sketch said to contain the secret of the atomic bomb. It was seen by Harold Urey, Nobel Laureate, leading participant in the atom bomb project; Henry Linschitz, deeply involved in developing the implosion mechanisms; Robert Christie, the designer of the initiator critical to the operation of the nuclear core of the bomb and Philip Morrison, co-holder of the secret patent of the bomb and in charge of nuclear assembly of the weapon. 
          Each of the scientists referred to submitted affidavits, copies of which can be made to this Committee, which establish the utter worthlessness of the Greenglass description and sketch which could not in any way aid or abet the Soviet Union in their development of the atomic bomb. The affidavit of Dr. Morrison was endorsed by Dr. Robert J. Oppenheimer, the director in charge of the development of the weapon at Los Alamos. In addition, the sketch and description was made available to Dr. George Kistiakowsky who was in charge of the explosives division of the atomic project and adviser to President Eisenhower on scientific and weapons matters; and to Dr. Victor Weisskopf, part of the theoretical division of the project at Los Alamos, former president of the American Physical Society and past Chairman of the Physics Department of the Massachusetts Institute of Technology. The sum and substance of the opinion of this eminent body of scientists was that the drawing and sketch was an ignorant, crude, childlike miscomprehension of the nature, constituents and the mechanisms of the atomic bomb. In characterizing the Greenglass testimony and sketch, such phrases as "uselessly crude", "ridiculous, a baby drawing, it doesn't tell you anything"; a caricature " of the bomb; "authenticated" by the government's "expert" witness, John Derry, who was neither a scientist nor had any knowledge of the design, construction or theory of the atomic bomb and who was in no way associated with its design, mechanism or content.