File:Silicon-antimony crystal detector 1919.jpg
Original file (1,340 × 952 pixels, file size: 278 KB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionSilicon-antimony crystal detector 1919.jpg |
English: A crystal detector, an obsolete electronic component used as a demodulator in crystal radios, displayed at the SPARK Museum of Electrical Invention, Bellingham, Washington, USA. This was a sophisticated model from 1919 used in military wireless telegraphy stations. It consisted of a point made of antimony mounted on a leaf spring, which pressed against a piece of silicon mounted in a cup with fusible alloy. Since only certain sites on the silicon crystal functioned as rectifying junctions, the silicon was mounted on an adjustable "stage" which could be moved in two horizontal directions by the micrometer knobs at right, to find a sensitive spot. The silicon detector was invented in 1906 by Greenleaf Whittier Pickard. It was used in receivers in military and shipboard wireless stations because it's sturdy contact could not be jarred loose by vibrations from waves or gunfire as easily as the delicate cat whisker detectors used in amateur stations. |
Date | |
Source | Own work |
Author | Chetvorno |
Permission (Reusing this file) |
Oral permission for photography was given by admissions employee of Spark Museum. |
Camera location | 48° 45′ 05.55″ N, 122° 28′ 50.29″ W | View this and other nearby images on: OpenStreetMap | 48.751542; -122.480636 |
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Licensing
[edit]This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication. | |
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
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current | 02:20, 23 October 2018 | 1,340 × 952 (278 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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Metadata
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Camera manufacturer | Apple |
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Camera model | iPhone 6s |
Exposure time | 1/15 sec (0.066666666666667) |
F-number | f/2.2 |
ISO speed rating | 250 |
Date and time of data generation | 15:39, 22 September 2018 |
Lens focal length | 4.15 mm |
Latitude | 48° 45′ 5.55″ N |
Longitude | 122° 28′ 50.29″ W |
Altitude | 32.85 meters above sea level |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | GIMP 2.8.22 |
File change date and time | 18:55, 22 October 2018 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 15:39, 22 September 2018 |
Meaning of each component |
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APEX shutter speed | 3.9069698759598 |
APEX aperture | 2.2750071245369 |
APEX brightness | −0.46752265861027 |
APEX exposure bias | 0 |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
DateTimeOriginal subseconds | 417 |
DateTimeDigitized subseconds | 417 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Scene type | A directly photographed image |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Focal length in 35 mm film | 29 mm |
Scene capture type | Standard |
GPS time (atomic clock) | 22:39:12.44 |
Speed unit | Kilometers per hour |
Speed of GPS receiver | 0 |
Reference for direction of image | True direction |
Direction of image | 222.10857142857 |
Reference for bearing of destination | True direction |
Bearing of destination | 222.10857142857 |
GPS date | 22 September 2018 |
Image width | 4,032 px |
Image height | 3,024 px |