Draft of a letter to FDR written by Leo Szilard
and signed by Albert Einstein —
For the letter as sent , see a webpage on the Manhattan Project.
This post was suggested by a New York Times obituary today that
contained the following misleading description —
"a 1939 letter from Albert Einstein to President Franklin D. Roosevelt
encouraging the American effort to build the atomic bomb."
There was apparently no such effort until after the letter was received.