On This day — Einstein Letter to Franklin Roosevelt (October 11 1939) [Manhattan Project]

“I made one great mistake in my life — when I signed the letter to President Roosevelt recommending that atom bombs be made but there was some justification — the danger that the Germans would make them.”

Albert Einstein


Einstein and Szilard re-enact discussion of letter to FDR for 1946 documentary Atomic Power

October 11 2020 — On October 11 1939, Alexander Sachs, Wall Street economist and longtime friend and unofficial advisor to President Franklin Delano Roosevelt, met with the President to discuss a letter written by Albert Einstein the previous August.  Einstein had written to inform Roosevelt that recent research on fission chain reactions utilizing uranium made it probable that large amounts of power could be produced by a chain reaction and that, by harnessing this power, the construction of “extremely powerful bombs” was conceivable.  Follow us on Twitter: @INTEL_TODAY

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Einstein believed the German government was actively supporting research in this area and urged the United States government to do likewise.  Sachs read from a cover letter he had prepared and briefed Roosevelt on the main points contained in Einstein’s letter.

Initially the President was noncommittal and expressed concern over locating the necessary funds, but at a second meeting over breakfast the next morning Roosevelt became convinced of the value of exploring atomic energy.

Einstein drafted his famous letter with the help of the Hungarian émigré physicist Leo Szilard, one of a number of European scientists who had fled to the United States in the 1930s to escape Nazi and Fascist repression.

Szilard was among the most vocal of those advocating a program to develop bombs based on recent findings in nuclear physics and chemistry.

Those like Szilard and fellow Hungarian refugee physicists Edward Teller and Eugene Wigner regarded it as their responsibility to alert Americans to the possibility that German scientists might win the race to build an atomic bomb and to warn that Hitler would be more than willing to resort to such a weapon.

But Roosevelt, preoccupied with events in Europe, took over two months to meet with Sachs after receiving Einstein’s letter.  Szilard and his colleagues interpreted Roosevelt’s inaction as unwelcome evidence that the President did not take the threat of nuclear warfare seriously.

Roosevelt wrote Einstein back on October 19, 1939, informing the physicist that he had set up a committee consisting of civilian and military representatives to study uranium.

Events proved that the President was a man of considerable action once he had chosen a direction.

In fact, Roosevelt’s approval of uranium research in October 1939, based on his belief that the United States could not take the risk of allowing Hitler to achieve unilateral possession of “extremely powerful bombs,” was merely the first decision among many that ultimately led to the establishment of the Manhattan Project.

The Letter That Led to the Atomic Bomb

“I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.”

“The release of atom power has changed everything except our way of thinking…the solution to this problem lies in the heart of mankind. If only I had known, I should have become a watchmaker.”

Albert Einstein


EINSTEIN’S LETTER — The Manhattan Project


On This Day — Einstein Letter to FDR (October 11 1939)

80 Years Ago — Einstein Letter to Franklin Roosevelt (October 11 1939) [Manhattan Project]

On This day — Einstein Letter to Franklin Roosevelt (October 11 1939) [Manhattan Project]

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