522:"}},"text\/plain":{"en":{"":"inception"}}},"{\"value\":{\"time\":\"+1938-10-01T00:00:00Z\",\"timezone\":0,\"before\":0,\"after\":0,\"precision\":10,\"calendarmodel\":\"http:\\\/\\\/www.wikidata.org\\\/entity\\\/Q1985727\"},\"type\":\"time\"}":{"text\/html":{"en":{"P571":"October 1938"}},"text\/plain":{"en":{"P571":"October 1938"}}}}": -->
467:
250:
67:
628:
518:
38:
142:
Metal horn recently devised and successfully used by Prof. Wilmer L. Barrow in focusing ultra-short waves; waves in the range 300 to 4300 megacycles (wavelengths from 1 meter to 7 centimeters).
287:), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
737:
519:
78:
205:
magazine would have the copyright renewed in 1966. Online page scans of the
Catalog of Copyright Entries, published by the US Copyright Office can be found
46:
164:
263:
because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the
194:
627:
622:
265:
284:
529:
508:
129:
in 1938. A horn antenna is a flaring metal horn used to direct microwaves from a waveguide into a beam. Although
457:
697:
597:
592:
37:
280:
86:
209:. Search of the Renewals for Periodicals for 1965, 1966, and 1967 show no renewal entries for
608:
130:
270:
8:
169:
magazine, Popular Book Corp., Springfield, MA, USA, Vol. 9, No. 6, October 1938, p. 332
727:
283:
for US works (depending on the date of the author's death), such as Canada (70 years
126:
73:
498:
447:
438:
669:
393:
411:
638:
429:
420:
402:
384:
375:
366:
357:
348:
339:
330:
321:
312:
303:
294:
259:
707:
279:
Note that it may still be copyrighted in jurisdictions that do not apply the
122:
274:
206:
659:
539:
213:. Therefore the copyright was not renewed and it is in the public domain.
134:
172:
133:
invented the horn antenna during his pioneering 1897 experiments with
664:
565:
Click on a date/time to view the file as it appeared at that time.
717:
687:
61:
492:
Add a one-line explanation of what this file represents
153:
747:
653:
678:
563:
85:
Commons is a freely licensed media file repository.
466:
51:(277 × 220 pixels, file size: 37 KB, MIME type:
66:
189:
149:
108:
178:
159:
14:
165:"Metal Horn Focuses Ultra-Short Waves" in
680:The following other wikis use this file:
111:Wilmer Barrow & horn antenna 1938.jpg
47:Wilmer_Barrow_&_horn_antenna_1938.jpg
655:The following 3 pages use this file:
249:
97:
728:Listă de oameni din statul Louisiana
244:
645:User created page with UploadWizard
556:
173:http://www.americanradiohistory.com
13:
497:
491:
465:
255:
115:
98:
44:
761:
708:Bruker:Cocu/Liste/Edison-medaljen
496:
482:
248:
163:Retrieved October 27, 2015 from
65:
31:
21:
479:
269:. For further explanation, see
116:
41:No higher resolution available.
675:
560:
478:
26:
1:
448:
439:
650:
504:Items portrayed in this file
220:
7:
394:
10:
766:
744:Usage on www.wikidata.org
734:Usage on ru.wikipedia.org
724:Usage on ro.wikipedia.org
714:Usage on pt.wikipedia.org
704:Usage on no.wikipedia.org
694:Usage on fa.wikipedia.org
684:Usage on es.wikipedia.org
275:the copyright renewal logs
105:
100:
557:
470:Flag of the United States
412:
266:copyright was not renewed
16:
481:
430:
421:
403:
385:
376:
367:
358:
349:
340:
331:
322:
313:
304:
295:
281:rule of the shorter term
72:This is a file from the
36:
738:Микроволновое излучение
644:
614:
152:
76:. Information from its
623:06:08, 28 October 2015
471:
79:description page there
469:
131:Jagadish Chandra Bose
718:Wilmer Lanier Barrow
271:Commons:Hirtle chart
257:This work is in the
395:português do Brasil
201:This 1938 issue of
472:
125:and its inventor,
676:Global file usage
648:
610:Materialscientist
593:19:22, 2 May 2021
490:
476:
475:
460:
243:
242:
217:
216:
198:
195:Reusing this file
121:The first modern
94:
93:
74:Wikimedia Commons
32:Global file usage
757:
688:Antena de bocina
670:Wilmer L. Barrow
635:
605:
567:
488:
468:
461:
456:
252:
251:
245:
239:
236:
233:
230:
225:
224:
211:Short Wave Craft
203:Short Wave Craft
192:
185:
167:Short Wave Craft
155:
127:Wilmer L. Barrow
120:
112:
106:
90:
69:
68:
62:
56:
54:
765:
764:
760:
759:
758:
756:
755:
754:
674:
649:
641:
633:
611:
603:
559:
558:
555:
554:
553:
552:
551:
550:
549:
548:
546:
536:
535:
534:
532:
517:
516:
515:
514:
513:
511:
495:
494:
493:
450:
441:
432:
423:
414:
405:
396:
387:
378:
369:
360:
351:
342:
333:
324:
315:
306:
297:
293:
290:
288:
237:
234:
231:
228:
223:
218:
183:
145:
110:
103:
96:
95:
84:
83:
82:is shown below.
58:
52:
50:
43:
42:
12:
11:
5:
763:
753:
752:
751:
750:
742:
741:
740:
732:
731:
730:
722:
721:
720:
712:
711:
710:
702:
701:
700:
692:
691:
690:
677:
673:
672:
667:
662:
652:
647:
646:
643:
639:
636:
630:
625:
620:
617:
616:
613:
609:
606:
600:
595:
590:
586:
585:
582:
579:
576:
573:
570:
562:
547:
544:
542:
541:
540:
538:
537:
533:
528:
526:
525:
524:
523:
521:
512:
507:
505:
502:
501:
500:
499:
487:
486:
483:
480:
474:
473:
463:
278:
253:
241:
240:
222:
219:
215:
214:
199:
187:
186:
184:Unknown author
182:Unknown author
180:
176:
175:
161:
157:
156:
151:
147:
146:
113:
104:
102:
99:
92:
91:
70:
60:
59:
40:
35:
34:
29:
24:
19:
9:
6:
4:
3:
2:
762:
749:
746:
745:
743:
739:
736:
735:
733:
729:
726:
725:
723:
719:
716:
715:
713:
709:
706:
705:
703:
699:
696:
695:
693:
689:
686:
685:
683:
682:
681:
671:
668:
666:
663:
661:
658:
657:
656:
642:
637:
631:
629:
626:
624:
621:
619:
618:
612:
607:
601:
599:
596:
594:
591:
588:
587:
583:
580:
577:
574:
571:
569:
568:
566:
543:
531:
527:
510:
506:
503:
484:
477:
464:
462:
459:
455:
451:
446:
442:
437:
433:
428:
424:
419:
415:
410:
406:
401:
397:
392:
388:
383:
379:
374:
370:
365:
361:
356:
352:
347:
343:
338:
334:
329:
325:
320:
316:
311:
307:
302:
298:
291:
289:
286:
282:
276:
272:
268:
267:
262:
261:
260:public domain
254:
247:
246:
232:Public domain
229:Public domain
227:
226:
212:
208:
204:
200:
196:
191:
188:
181:
177:
174:
170:
168:
162:
158:
148:
143:
139:
138:
136:
132:
128:
124:
119:
114:
107:
88:
81:
80:
75:
71:
64:
63:
57:
48:
39:
33:
30:
28:
25:
23:
20:
18:
15:
679:
660:Horn antenna
654:
564:
561:File history
545:October 1938
453:
444:
435:
426:
417:
408:
399:
390:
381:
372:
363:
354:
345:
336:
327:
318:
309:
300:
292:
264:
258:
256:
210:
202:
166:
154:October 1938
141:
123:horn antenna
117:
87:You can help
77:
45:
22:File history
698:ویلیام بارو
422:slovenščina
109:Description
651:File usage
632:277 × 220
602:277 × 220
578:Dimensions
431:українська
377:македонски
190:Permission
140:Caption: "
135:microwaves
53:image/jpeg
27:File usage
665:Microwave
640:Chetvorno
575:Thumbnail
572:Date/Time
530:inception
520:inception
413:sicilianu
386:português
221:Licensing
118:English:
748:Q8022705
485:Captions
350:italiano
332:français
634:(17 KB)
604:(37 KB)
589:current
584:Comment
509:depicts
489:English
404:русский
323:español
314:English
305:Deutsch
296:العربية
101:Summary
49:
452:
443:
434:
425:
416:
407:
398:
389:
380:
371:
362:
353:
344:
341:galego
335:
326:
317:
308:
299:
285:p.m.a.
179:Author
160:Source
238:false
235:false
581:User
449:繁體中文
440:简体中文
273:and
207:here
150:Date
17:File
615:FFT
458:+/−
368:한국어
359:日本語
171:on
277:.
454:∙
445:∙
436:∙
427:∙
418:∙
409:∙
400:∙
391:∙
382:∙
373:∙
364:∙
355:∙
346:∙
337:∙
328:∙
319:∙
310:∙
301:∙
197:)
193:(
144:"
89:.
55:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
