Size of this preview: 800 × 597 pixels. Other resolutions: 320 × 239 pixels | 640 × 477 pixels | 945 × 705 pixels.
Original file (945 × 705 pixels, file size: 111 KB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
English: Blattnerphone steel tape recorder, an early magnetic recording technology, developed by Dr. Kurt Stille and Louis Blattner in 1924, at BBC studios, used to record programs for rebroadcast in Empire countries. The recording tape was 3mm wide and 0.08 mm thick, and traveled at 1.5 meters / second. It was limited to voice programs as it did not have the fidelity to record music. Caption: "One of the Blattnerphone BBC recording machines on which the programs are recorded by a magnetic process for Empire broadcasting" |
| Date | |
| Source | Retrieved April 11, 2014 from Douglas Hallam, Jr., "The BBC Program Transmission System", in Communication and Broadcast Engineering magazine, Bryan Davis Publishing Co., New York, Vol. 4, No. 2, February 1937, p. 13 on American Radio History website |
| Author | Douglas Hallam, Jr. |
| Permission (Reusing this file) |
This 1937 issue of Communication and Broadcast Engineering magazine would have the copyright renewed in 1955. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1954, 1955 and 1956 show no renewal entries for Communication and Broadcast Engineering. Therefore the magazine's copyright was not renewed and it is in the public domain. |
Licensing
|
This work is in the public domain 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 copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
|
 |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:35, 11 April 2014 | | 945 × 705 (111 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following 2 pages use this file:
Global file usage
The following other wikis use this file:
- Usage on cs.wikipedia.org
- Usage on da.wikipedia.org
- Usage on fr.wikipedia.org
- Usage on ja.wikipedia.org
- Usage on ms.wikipedia.org
- Usage on nl.wikipedia.org
