Файлах лаьцна

Цуьнах лаьцнаEinstein-Roosevelt-letter.png	English: Scan of the letter sent to U.S. President Franklin D. Roosevelt on August 2, 1939, was signed by Albert Einstein but largely written by Hungarian physicist Leo Szilard. For more information on the letter and its context see its entry at the English Wikipedia.
Хьост	Franklin D. Roosevelt Presidential Library & Museum 4079 Albany Post Road Hyde Park, NY 12538 http://www.fdrlibrary.marist.edu/psf/box5/a64a01.html http://www.fdrlibrary.marist.edu/psf/box5/a64a02.html
Автор	Эйнштейн, Альберт  (1879–1955)       Альтернативан цӀерш Albert Einstein Цуьнах лаьцна Германско-американский физик He became famous for developing his theory of relativity, especially the equivalence of mass and energy, expressed by the most famous physical formula of the world E = mc². Вина/йина терахь/дӀакхелхина 1879 шeран 14 март  1955 шeран 18 апрель  Вина/йина меттиг/дӀакхелхина Ульм Принстон Кхоллараллин шераш 1900-1955 Кхоллараллин меттиг Цуьрих, Швейцари; Берн, Швейцари; Прага, Австро-Венгри; Берлин, Германская империя; Пасадена (Калифорни), АЦШ; Принстон, АЦШ Авторитетный файл : Q937 VIAF: 75121530 ISNI: 000000012281955X ORCID: 0000-0001-9183-9538 ULAN: 500240971 Open Library: OL3175986A WorldCat creator QS:P170,Q937

Text of the letter

Sir:

Some recent work by E. Fermi and L. Szilard, which has been communicated to me in manuscript, leads me to expect that the element uranium may be turned into a new and important source of energy in the immediate future. Certain aspects of the situation which has arisen seem to call for watchfulness and, if necessary, quick action on the part of the Administration. I believe therefore that it is my duty to bring to your attention the following facts and recommendations:

In the course of the last four months it has been made probable - through the work of Joliot in France as well as Fermi and Szilard in America - that it may become possible to set up a nuclear chain reaction in a large mass of uranium, by which vast amounts of power and large quantities of new radium-like elements would be generated. Now it appears that almost certain that this could be achieved in the immediate future.

This new phenomenon would also lead to the construction of bombs, and it is conceivable - but much less certain - that extremely powerful bombs of a new type may thus be constructed. A single bomb of this type, carried by boat and exploded in a port, might very well destroy the whole port together with some of the surrounding territory. However, such bombs might very well prove to be too heavy for transportation by air.

-2-

The United States has only very poor ores of uranium in moderate quantities. There are some good ores In Canada and the former Czechoslovakia, while the most important source of uranium is Belgian Congo.

In view of the situation you may think it desirable to have some permanent contact maintained between the administration and the group of physicists working on chain reactions in America. One possible way of achieving this might be for you to entrust with this task a person who has your confidence and who could perhaps serve in an inofficial capacity. His task might comprise the following:

a) to approach Government Departments, keep them informed of the further development, and put forward recommendations for government action, giving particular attention to the problem of securing a supply of uranium ore for the United States;

b) to speed up the experimental work, which is at present being carried on within the limits of the budgets of University laboratories, by providing funds, if such funds be required, through his contacts with private persons who are willing to make contributions for this cause, and perhaps also by obtaining the cooperation of industrial laboratories which have the necessary equipment.

I understand that Germany has actually stopped the sale of uranium from the Czechoslovakian mines which she has taken over. That she should have taken such early action might perhaps be understood on the ground that the son of the German Under–Secretary of state, von Weiszäcker, is attached to the Kaiser-Wilhelm-Institut in Berlin where some of the American work on uranium is now being repeated.

Response

View Roosevelt's response of October 19, 1939

Лицензи

The Einstein letter was published in 1945, as part of the Smyth Report, without a copyright notice. It is thus in the public domain in the USA.

Это произведение находится в общественном достоянии, поскольку оно было опубликовано в США между 1929 и 1977 годами без уведомления об авторских правах. Если автор не умер определённое количество лет назад, то это произведение защищено авторским правом в юрисдикциях, не применяющих правило более короткого срока для произведений из США, например, в Канаде (50 p.m.a.), Континентальном Китае (50 p.m.a., не в Гонконге и Макао), Германии (70 p.m.a.), Мексике (100 p.m.a.), Швейцарии (70 p.m.a.), а также в других странах в соответствии с индивидуальными соглашениями. См. эту страницу для дополнительных пояснений. العربية ∙ беларуская (тарашкевіца) ∙ čeština ∙ Deutsch ∙ Ελληνικά ∙ English ∙ español ∙ français ∙ Bahasa Indonesia ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ Nederlands ∙ português ∙ русский ∙ sicilianu ∙ slovenščina ∙ ไทย ∙ Tiếng Việt ∙ 中文（简体） ∙ 中文（繁體） ∙ +/−