The Manhattan Project

In partnership with the National Museum of Nuclear Science & HistoryNational Museum of Nuclear Science & History

Wilmington, DE

Raymond Grills

Dr. Raymond Grills was a DuPont physical chemist who worked at Chicago and later at Hanford during the Manhattan Project. While at Hanford, he was one of two men who invented the canning process that sealed uranium slugs for use in Hanford’s water-cooled nuclear reactors. In this interview, he describes the challenges and pressures he and his colleagues had to overcome, and explains why the canning had to be designed perfectly. He also describes humorous encounters with a machinist and a railroad porter while transporting uranium slugs.

Crawford Greenewalt, Jr.

Crawford Greenewalt, Jr., was an archeologist and the son of Crawford Greenewalt, a chemical engineer for the DuPont Company. The elder Greenewalt was assigned to act as a liaison between the physicists at the Chicago Met Lab and the engineers at Hanford, who were constructing the B Reactor. He went on to become the President of DuPont, and was renowned for his interest in photography, birds, and other scientific endeavors. Crawford Jr. discusses his family’s lineage, his father’s education and career, and his father’s busy schedule during the war.

Ernest Tremmel's Interview

Ernest Tremmel: I'm Ernie Tremmel. 

I graduated from the University of Wisconsin in civil engineering, and I went to work for the Corps of Engineers in St. Louis. One of my bosses was a Captain Powell who, after I was in St. Louis two years, got transferred to a secret project he was going to work on called the Manhattan Project Corps of Engineers.  

Ernest Tremmel

Ernest Tremmel was a civil engineer who worked on the Manhattan Project for the Army Corps of Engineers, as a purchasing officer. He went on to work for the Atomic Energy Commission (AEC) for many years and as a nuclear energy consultant. In this interview, Tremmel discusses the secrecy of the Manhattan Project and how he learned the goal of the project. He recalls interacting with General Leslie R. Groves, Admiral Hyman Rickover, and other AEC commissioners as well as directors of energy companies.

Nancy Greenewalt Frederick's Interview (2006)

Nancy Greenewalt Frederick: My father, Crawford Greenewalt, was the only child of Dr. Frank Lindsay Greenewalt and Mary Hallock Greenewalt. Dr. Greenewalt was a physician at Gerard College in Philadelphia, and my father grew up there most of his young life. He went to a German school, what we would call a preschool, run by German monks when he was a child. He says he spoke German before he spoke English. But when he was grown up he could do some German, but he couldn’t speak it.

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