This blog features the personal diaries of John Hamilton Ruckman (1888-1966). Ruckman was the son of Gen. John W. Ruckman and a graduate of M.I.T. and the University of California. He was also an Army captain in World War I and a colonal in World War II. These entries cover the period Ruckman served as chief engineer for the Fercleve Corporation, Oak Ridge, TN (the Manhattan Project).