File:Edward_Kellogg_&_Chester_Rice_with_cone_speaker_1925.jpg
From Wikipedia, the free encyclopedia
Original file (935 × 603 pixels, file size: 360 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
DescriptionEdward Kellogg & Chester Rice with cone speaker 1925.jpg |
English: The first electrodynamic cone loudspeaker invented in 1925 at General Electric laboratories in Schenectady, New York, with inventors Edward W. Kellogg and Chester W. Rice. Modern loudspeakers are based on this design, which combined the moving coil driver mechanism with a paper cone diaphragm. They are holding the driver unit; the completed speaker with its 6 inch cone, is partially visible behind them.
Kellogg and Rice invented the concept in 1921, but it took until 1925 to improve the acoustics enough to compete with existing horn loudspeakers. They filed for patents and announced the device in 1925. The speaker's advantage was that it had flatter frequency response than horn speakers, and could reproduce adequate bass without the enormous length of sound path required in horns. The first commercial model, the RCA Radiola Loudspeaker #104, went on sale in 1926 for $250, about $2000 in today's dollars. Information from History and types of loudspeakers, Edison Tech Center |
Date | |
Source | Retrieved September 24, 2014 from W. T. Meenam, "A new type of hornless loudspeaker" in Popular Radio magazine, published by Popular Radio, Inc., New York, Vol. 8, No. 2, August 1925, p. 128 on American Radio History website |
Author | W. T. Meenam |
Licensing
Public domainPublic domainfalsefalse |
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Edward_Kellogg_%26_Chester_Rice_with_cone_speaker_1925.jpg |
Items portrayed in this file
depicts
August 1925Gregorian
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 17:00, 3 May 2021 | 935 × 603 (360 KB) | Materialscientist | FFT | |
17:43, 24 September 2014 | 948 × 617 (186 KB) | Chetvorno | User created page with UploadWizard |
File usage
Global file usage
The following other wikis use this file:
- Usage on ar.wikipedia.org
- Usage on bn.wikipedia.org
- Usage on mg.wikipedia.org
- Usage on ro.wikipedia.org
- Usage on ru.wikipedia.org
- Usage on www.wikidata.org