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Summary
| Description電気メガホンEM-202.JPG | English: TOA Corporation's EM-202, the first transistorized electric megaphone, or bullhorn. Developed in 1954, this was the first truly handheld public address system; previous portable P.A. systems were very heavy because of the vacuum tubes needed to power them. 日本語: 電気メガホンEM-202。東亞特殊電機製。世界初の電気メガホン。 |
| Date | |
| Source | Own work |
| Author | User:実用 |
Licensing
| Public domainPublic domainfalsefalse |
|
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
Captions
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:49, 17 May 2009 | | 1,024 × 768 (161 KB) | 実用 | {{Information |Description={{en|1=EM-202}} {{ja|1=電気メガホンEM-202}} |Source=私物 |Author=私 |Date=2009年 |Permission= |other_versions= }} <!--{{ImageUpload|full}}--> Category:メガホン 拡声器 |
File usage
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Global file usage
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- Usage on ja.wikipedia.org
- Usage on pnb.wikipedia.org
Metadata
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| Camera manufacturer | NIKON |
|---|---|
| Camera model | COOLPIX L3 |
| Exposure time | 2/21 sec (0.095238095238095) |
| F-number | f/3.2 |
| ISO speed rating | 50 |
| Date and time of data generation | 13:06, 17 May 2009 |
| Lens focal length | 6.3 mm |
| Orientation | Normal |
| Horizontal resolution | 300 dpi |
| Vertical resolution | 300 dpi |
| Software used | COOLPIX L3v1.2 |
| File change date and time | 13:06, 17 May 2009 |
| Y and C positioning | Co-sited |
| Exposure Program | Normal program |
| Exif version | 2.2 |
| Date and time of digitizing | 13:06, 17 May 2009 |
| Image compression mode | 2 |
| Exposure bias | 0 |
| Maximum land aperture | 3.4 APEX (f/3.25) |
| Metering mode | Pattern |
| Light source | Unknown |
| Flash | Flash did not fire, compulsory flash suppression |
| Color space | sRGB |
| Custom image processing | Normal process |
| Exposure mode | Auto exposure |
| White balance | Auto white balance |
| Digital zoom ratio | 0 |
| Focal length in 35 mm film | 38 mm |
| Scene capture type | Standard |
| Contrast | Normal |
| Saturation | Normal |
| Sharpness | Normal |
| Subject distance range | Unknown |