What years would Lyman James Briggs have been the director of the National Bureau of Standards, if he was a  a director of the National Bureau of Standards during the Great Depression?
Lyman James Briggs:  He was a director of the National Bureau of Standards during the Great Depression and chairman of the Uranium Committee before America entered the Second World War. Great Depression: The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, originating in the United States.
mostly during the 1930s