337:
329:
944:
295:
38:
274:
280:
463:
268:
262:
90:
686:
1346:
621:
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
617:
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
609:
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
598:
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
590:
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
594:
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
1341:
1090:
1336:
613:
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;
1181:
1166:
1286:
605:
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.
1316:
1416:
1531:
1461:
452:
591:
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:
318:
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.
1560:
728:), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
1481:
1331:
1171:
1291:
485:
472:
1471:
1138:
715:
56:
1526:
1221:
52:
48:
42:
1201:
101:
69:
1411:
595:
radium-like elements would be generated. Now it appears that almost certain that this could be achieved in the immediate future.
517:
599:
with some of the surrounding territory. However, such bombs might very well prove to be too heavy for transportation by air.
491:
1001:
511:
641:
1021:
1133:
1281:
985:
211:
725:
721:
435:
354:
1326:
423:
388:
934:
273:
1129:
The following pages on the
English Knowledge (XXG) use this file (pages on other projects are not listed):
199:
1108:
524:
622:
Kaiser-Wilhelm-Institut in Berlin where some of the
American work on uranium is now being repeated.
405:
261:
252:
109:
451:
1371:
1089:
1084:
60:
37:
706:
610:
and who could perhaps serve in an inofficial capacity. His task might comprise the following:
441:
429:
417:
711:
279:
203:
700:
1301:
1112:
618:
obtaining the cooperation of industrial laboratories which have the necessary equipment.
393:
381:
235:
231:
695:
1191:
1376:
1361:
652:
96:
744:
336:
328:
924:
915:
207:
1516:
1506:
1426:
1116:
1100:
436:
355:
724:
for US works (depending on the date of the author's death), such as Canada (50
538:
418:
1491:
1231:
879:
411:
399:
375:
906:
897:
888:
870:
861:
852:
843:
834:
825:
816:
807:
798:
789:
780:
771:
762:
753:
735:
720:
Note that it may still be copyrighted in jurisdictions that do not apply the
424:
1551:
1381:
412:
1261:
530:
498:
1446:
1436:
1391:
655:, without a copyright notice. It is thus in the public domain in the USA.
1306:
387:
294:
1271:
1251:
1156:
504:
478:
123:
462:
347:
267:
1266:
253:
376:
1057:
Click on a date/time to view the file as it appeared at that time.
1241:
442:
430:
129:
1456:
122:
467:
348:
680:
246:
84:
1541:
1356:
1211:
942:
1246:
651:
The
Einstein letter was published in 1945, as part of the
406:
400:
745:
210:. For more information on the letter and its context see
1401:
969:
Add a one-line explanation of what this file represents
925:
916:
703:
in the United States between 1929 and 1977, inclusive,
225:
Franklin D. Roosevelt Presidential Library & Museum
236:
http://www.fdrlibrary.marist.edu/psf/box5/a64a02.html
232:
http://www.fdrlibrary.marist.edu/psf/box5/a64a01.html
182:
108:
Commons is a freely licensed media file repository.
880:
74:(1,500 × 881 pixels, file size: 286 KB, MIME type:
907:
898:
889:
871:
862:
853:
844:
835:
826:
817:
808:
799:
790:
781:
772:
763:
754:
736:
1501:
1347:פורטל:מלחמת העולם השנייה/היום בהיסטוריה/2 באוגוסט
943:
394:
382:
1342:פורטל:מלחמת העולם השנייה/היום בהיסטוריה/אוגוסט
89:
642:View Roosevelt's response of October 19, 1939
8:
1115:but largely written by Hungarian physicist
206:but largely written by Hungarian physicist
1107:Scan of the letter sent to U.S. President
1059:
965:
933:
660:
335:
327:
198:Scan of the letter sent to U.S. President
1149:The following other wikis use this file:
1362:Suradnik:Edgar Allan Poe/Albert Einstein
212:its entry at the English Knowledge (XXG)
1139:User:Abdel Rahman Samir/Albert Einstein
1131:
1035:
1019:
999:
983:
980:
961:
954:
145:
1337:השקפותיו הפוליטיות של אלברט איינשטיין
7:
699:in the United States because it was
1372:Szerkesztővita:OrsolyaVirág/Archív6
1048:
974:
968:
691:
192:
124:
121:
67:
1111:on August 2, 1939, was signed by
973:
718:of "publication" for public art.
202:on August 2, 1939, was signed by
959:
684:
461:
293:
278:
272:
266:
260:
88:
31:
21:
1492:User talk:Orschstaffer/archive!
1167:الآراء السياسية لألبرت أينشتاين
956:
710:. For further explanation, see
579:President of the United States,
193:
14:
1302:Réaction en chaîne (nucléaire)
1287:دیدگاههای سیاسی آلبرت اینشتین
1262:Usuario:L3GOLAS/sinreferencias
955:
165:
26:
1:
1447:Saeculum Mirabilis/Capitolo 5
188:Einstein-Roosevelt-letter.png
155:
1488:Usage on meta.wikimedia.org
1392:Einstein levele Roosevelthez
981:Items portrayed in this file
135:
1548:Usage on sk.wikisource.org
1478:Usage on ko.wikisource.org
1417:Այնշտայնի նամակը Ռուզվելտին
1398:Usage on hu.wiktionary.org
1388:Usage on hu.wikisource.org
1577:
1538:Usage on sh.wikipedia.org
1532:Письмо Эйнштейна Рузвельту
1523:Usage on ru.wikipedia.org
1513:Usage on pt.wikipedia.org
1498:Usage on no.wikipedia.org
1468:Usage on ko.wikipedia.org
1453:Usage on ja.wikipedia.org
1443:Usage on it.wikibooks.org
1433:Usage on it.wikipedia.org
1423:Usage on id.wikipedia.org
1408:Usage on hy.wikipedia.org
1382:A Manhattan terv idővonala
1368:Usage on hu.wikipedia.org
1353:Usage on hr.wikipedia.org
1323:Usage on he.wikipedia.org
1313:Usage on gu.wikipedia.org
1298:Usage on fr.wikipedia.org
1278:Usage on fa.wikipedia.org
1258:Usage on es.wikipedia.org
1238:Usage on de.wikipedia.org
1228:Usage on cs.wikipedia.org
1218:Usage on ce.wikipedia.org
1208:Usage on ca.wikipedia.org
1198:Usage on be.wikipedia.org
1188:Usage on az.wikipedia.org
1178:Usage on as.wikipedia.org
1163:Usage on ar.wikipedia.org
1153:Usage on af.wikipedia.org
1552:Einsteinov-Szilárdov list
1049:
947:Flag of the United States
457:
450:
373:
370:
365:
362:
343:
322:
316:German-American physicist
315:
312:
305:
302:
291:
249:
16:
1437:Lettera Einstein-Szilárd
1267:Usuario:L3GOLAS/Einstein
958:
746:беларуская (тарашкевіца)
722:rule of the shorter term
443:United States of America
431:United States of America
95:This is a file from the
1307:Lettre Einstein-Szilárd
1232:Einstein-Szilárdův list
1192:Eynşteyn–Silard məktubu
1182:আইনষ্টাইন-জিলাৰ্ডৰ চিঠি
1134:Einstein–Szilard letter
1106:
1085:20:52, 3 September 2007
1002:Einstein–Szilárd letter
344:Location of birth/death
259: (1879–1955)
241:
221:
185:
99:. Information from its
1517:Carta Einstein–Szilárd
1507:Einstein–Szilárds brev
1427:Surat Einstein–Szilárd
1377:Einstein–Szilárd-levél
1272:Carta Einstein-Szilárd
1252:Einstein-Szilárd-Brief
1157:Einstein-Szilárd-brief
948:
102:description page there
41:Size of this preview:
1332:מכתב איינשטיין-סילארד
1172:رسالة أينشتاين-زيلارد
1109:Franklin D. Roosevelt
946:
307:Einstein; A. Einstein
227:4079 Albany Post Road
200:Franklin D. Roosevelt
1119:. For more informati
712:Commons:Hirtle chart
693:This work is in the
571:Peconic, Long Island
551:creator QS:P170,Q937
229:Hyde Park, NY 12538
1292:نامه اینشتین–زیلارد
716:detailed definition
505:0000-0001-9183-9538
334:18 April 1955
326:14 March 1879
323:Date of birth/death
47:Other resolutions:
1317:આલ્બર્ટ આઇન્સ્ટાઇન
949:
632:(Albert Einstein)
626:Yours very truly,
560:Text of the letter
150:Text of the letter
61:1,500 × 881 pixels
57:1,024 × 601 pixels
1561:more global usage
1527:Эйнштейн, Альберт
1222:Эйнштейн, Альберт
1145:Global file usage
1122:
967:
953:
952:
937:
679:
678:
583:Washington, D.C.
556:
555:
548:
547:
303:Alternative names
130:
117:
116:
97:Wikimedia Commons
32:Global file usage
1568:
1482:번역:아인슈타인-실라르드 편지
1462:アインシュタイン＝シラードの手紙
1202:Альберт Эйнштэйн
1097:
945:
938:
809:Bahasa Indonesia
707:copyright notice
688:
687:
681:
675:
672:
669:
666:
661:
577:F. D. Roosevelt,
574:August 2nd, 1939
541:
534:
533:
521:
520:
508:
507:
495:
494:
492:000000012281955X
482:
481:
465:
454:
444:
438:
432:
426:
420:
414:
408:
402:
396:
390:
384:
378:
357:
350:
339:
331:
298:
297:
286:
282:
276:
270:
264:
258:
255:
247:
197:
189:
183:
171:
168:
161:
158:
151:
148:
141:
138:
131:
113:
92:
91:
85:
79:
77:
64:
53:640 × 376 pixels
49:320 × 188 pixels
43:800 × 470 pixels
1576:
1575:
1571:
1570:
1569:
1567:
1566:
1565:
1542:Albert Einstein
1412:Ալբերտ Այնշտայն
1357:Albert Einstein
1212:Albert Einstein
1143:
1130:
1123:
1113:Albert Einstein
1103:
1095:
1051:
1050:
1047:
1046:
1045:
1044:
1043:
1042:
1041:
1040:
1038:
1028:
1027:
1026:
1024:
1013:
1012:
1011:
1010:
1009:
1008:
1007:
1006:
1004:
992:
991:
990:
988:
972:
971:
970:
927:
918:
909:
900:
891:
882:
873:
864:
855:
846:
837:
828:
819:
810:
801:
792:
783:
774:
765:
756:
747:
738:
734:
731:
729:
685:
673:
670:
667:
664:
649:
639:
634:
585:
565:Albert Einstein
562:
557:
552:
549:
544:
537:
529:
528:
516:
515:
503:
502:
490:
489:
477:
476:
446:
407:Austria-Hungary
308:
292:
287:
284:
257:
254:Albert Einstein
250:
217:
204:Albert Einstein
187:
180:
175:
169:
166:
159:
156:
149:
146:
139:
136:
132:
128:
119:
118:
107:
106:
105:is shown below.
81:
75:
73:
66:
65:
46:
12:
11:
5:
1574:
1572:
1563:of this file.
1557:
1556:
1555:
1554:
1546:
1545:
1544:
1536:
1535:
1534:
1529:
1521:
1520:
1519:
1511:
1510:
1509:
1504:
1496:
1495:
1494:
1486:
1485:
1484:
1476:
1475:
1474:
1466:
1465:
1464:
1459:
1451:
1450:
1449:
1441:
1440:
1439:
1431:
1430:
1429:
1421:
1420:
1419:
1414:
1406:
1405:
1404:
1396:
1395:
1394:
1386:
1385:
1384:
1379:
1374:
1366:
1365:
1364:
1359:
1351:
1350:
1349:
1344:
1339:
1334:
1329:
1321:
1320:
1319:
1311:
1310:
1309:
1304:
1296:
1295:
1294:
1289:
1284:
1276:
1275:
1274:
1269:
1264:
1256:
1255:
1254:
1249:
1244:
1236:
1235:
1234:
1226:
1225:
1224:
1216:
1215:
1214:
1206:
1205:
1204:
1196:
1195:
1194:
1186:
1185:
1184:
1176:
1175:
1174:
1169:
1161:
1160:
1159:
1147:
1146:
1142:
1141:
1136:
1128:
1127:
1126:
1121:
1120:
1105:
1101:
1098:
1092:
1087:
1082:
1078:
1077:
1074:
1071:
1068:
1065:
1062:
1055:
1054:
1039:
1036:
1034:
1033:
1032:
1031:
1030:
1029:
1025:
1020:
1018:
1017:
1016:
1015:
1014:
1005:
1000:
998:
997:
996:
995:
994:
993:
989:
984:
982:
979:
978:
977:
976:
975:
964:
963:
960:
957:
951:
950:
940:
719:
689:
677:
676:
648:
645:
638:
635:
624:
563:
561:
558:
554:
553:
550:
546:
545:
543:
542:
535:
522:
509:
496:
483:
470:
458:
456:
453:Authority file
448:
447:
374:
372:
368:
367:
364:
360:
359:
352:
345:
341:
340:
332:
324:
320:
319:
314:
310:
309:
306:
304:
300:
299:
289:
288:
283:
251:
245:
243:
239:
238:
223:
219:
218:
190:
181:
179:
176:
174:
173:
163:
153:
143:
127:
120:
115:
114:
93:
83:
82:
40:
36:
35:
34:
29:
24:
19:
13:
10:
9:
6:
4:
3:
2:
1573:
1564:
1562:
1553:
1550:
1549:
1547:
1543:
1540:
1539:
1537:
1533:
1530:
1528:
1525:
1524:
1522:
1518:
1515:
1514:
1512:
1508:
1505:
1503:
1500:
1499:
1497:
1493:
1490:
1489:
1487:
1483:
1480:
1479:
1477:
1473:
1472:아인슈타인-실라르드 편지
1470:
1469:
1467:
1463:
1460:
1458:
1455:
1454:
1452:
1448:
1445:
1444:
1442:
1438:
1435:
1434:
1432:
1428:
1425:
1424:
1422:
1418:
1415:
1413:
1410:
1409:
1407:
1403:
1400:
1399:
1397:
1393:
1390:
1389:
1387:
1383:
1380:
1378:
1375:
1373:
1370:
1369:
1367:
1363:
1360:
1358:
1355:
1354:
1352:
1348:
1345:
1343:
1340:
1338:
1335:
1333:
1330:
1328:
1325:
1324:
1322:
1318:
1315:
1314:
1312:
1308:
1305:
1303:
1300:
1299:
1297:
1293:
1290:
1288:
1285:
1283:
1282:آلبرت اینشتین
1280:
1279:
1277:
1273:
1270:
1268:
1265:
1263:
1260:
1259:
1257:
1253:
1250:
1248:
1247:Edward Teller
1245:
1243:
1240:
1239:
1237:
1233:
1230:
1229:
1227:
1223:
1220:
1219:
1217:
1213:
1210:
1209:
1207:
1203:
1200:
1199:
1197:
1193:
1190:
1189:
1187:
1183:
1180:
1179:
1177:
1173:
1170:
1168:
1165:
1164:
1162:
1158:
1155:
1154:
1152:
1151:
1150:
1144:
1140:
1137:
1135:
1132:
1124:
1118:
1114:
1110:
1104:
1099:
1093:
1091:
1088:
1086:
1083:
1080:
1079:
1075:
1072:
1069:
1066:
1063:
1061:
1060:
1058:
1052:
1023:
1003:
987:
941:
939:
936:
932:
928:
923:
919:
914:
910:
905:
901:
896:
892:
887:
883:
878:
874:
869:
865:
860:
856:
851:
847:
842:
838:
833:
829:
824:
820:
815:
811:
806:
802:
797:
793:
788:
784:
779:
775:
770:
766:
761:
757:
752:
748:
743:
739:
732:
730:
727:
723:
717:
714:as well as a
713:
709:
708:
702:
698:
697:
696:public domain
690:
683:
682:
668:Public domain
665:Public domain
663:
662:
659:
658:
656:
654:
646:
644:
643:
636:
633:
631:
630:
627:
623:
619:
615:
611:
607:
603:
600:
596:
592:
588:
584:
582:
580:
578:
576:
575:
573:
572:
570:
568:
567:Old Grove Rd.
566:
559:
540:
536:
532:
526:
523:
519:
513:
510:
506:
500:
497:
493:
487:
484:
480:
474:
471:
469:
464:
460:
459:
455:
449:
445:
439:
433:
427:
421:
419:German Empire
415:
409:
403:
397:
391:
385:
379:
371:Work location
369:
361:
358:
353:
351:
346:
342:
338:
333:
330:
325:
321:
317:
311:
301:
296:
290:
281:
275:
269:
263:
256:
248:
244:
240:
237:
234:
233:
230:
228:
226:
224:
220:
216:
213:
209:
205:
201:
196:
191:
184:
177:
172:
164:
162:
154:
152:
144:
142:
134:
133:
125:
111:
104:
103:
98:
94:
87:
86:
80:
71:
70:Original file
62:
58:
54:
50:
44:
39:
33:
30:
28:
25:
23:
20:
18:
15:
1558:
1327:פרויקט מנהטן
1148:
1094:1,500 × 881
1056:
1053:File history
930:
921:
912:
903:
894:
885:
876:
867:
858:
849:
840:
831:
822:
813:
804:
795:
786:
777:
768:
759:
750:
741:
733:
704:
694:
692:
657:
653:Smyth Report
650:
640:
628:
625:
620:
616:
612:
608:
604:
601:
597:
593:
589:
586:
569:Nassau Point
564:
215:
194:
110:You can help
100:
68:
22:File history
1242:Leó Szilárd
1117:Leo Szilard
890:slovenščina
629:A. Einstein
581:White House
395:Switzerland
383:Switzerland
363:Work period
313:Description
208:Leo Szilard
186:Description
1125:File usage
1070:Dimensions
1022:media type
908:Tiếng Việt
854:Nederlands
845:македонски
705:without a
27:File usage
1067:Thumbnail
1064:Date/Time
1037:image/png
881:sicilianu
863:português
701:published
647:Licensing
531:n79022889
518:500240971
437:Princeton
366:1900-1955
356:Princeton
195:English:
170:Licensing
76:image/png
1096:(286 KB)
962:Captions
818:italiano
800:français
773:Ελληνικά
637:Response
539:WorldCat
479:75121530
425:Pasadena
160:Response
126:Contents
1081:current
1076:Comment
986:depicts
966:English
872:русский
791:español
782:English
764:Deutsch
755:čeština
737:العربية
178:Summary
140:Summary
72:
1102:Schutz
929:
926:中文（繁體）
920:
917:中文（简体）
911:
902:
893:
884:
875:
866:
857:
848:
839:
830:
821:
812:
803:
794:
785:
776:
767:
758:
749:
740:
726:p.m.a.
413:Berlin
401:Prague
377:Zürich
285:
277:
271:
265:
242:Author
222:Source
1559:View
1402:levél
674:false
671:false
587:Sir:
499:ORCID
1502:Brev
1457:8月2日
1073:User
602:-2-
525:LCCN
512:ULAN
486:ISNI
473:VIAF
468:Q937
389:Bern
17:File
935:+/−
899:ไทย
836:한국어
827:日本語
349:Ulm
527::
514::
501::
488::
475::
466::
440:,
434:;
428:,
422:;
416:,
410:;
404:,
398:;
392:,
386:;
380:,
59:|
55:|
51:|
45:.
931:∙
922:∙
913:∙
904:∙
895:∙
886:∙
877:∙
868:∙
859:∙
850:∙
841:∙
832:∙
823:∙
814:∙
805:∙
796:∙
787:∙
778:∙
769:∙
760:∙
751:∙
742:∙
214:.
167:4
157:3
147:2
137:1
112:.
78:)
63:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
