What was the first of these types in which was supervised by Walter Zinn of the Manhattan Project?
Walter Zinn: Walter Henry Zinn (December 10, 1906 – February 14, 2000) was a nuclear physicist who was the first director of the Argonne National Laboratory from 1946 to 1956. Walter Zinn:  He worked at the Manhattan Project's Metallurgical Laboratory during World War II, and supervised the construction of Chicago Pile-1, the world’s first nuclear reactor, which went critical on December 2, 1942, at the University of Chicago. Chicago Pile-1:  Its construction was part of the Manhattan Project, the Allied effort to create atomic bombs during World War II.
i don't know