File:Silicon-antimony crystal detector 1919.jpg
Size of this preview: 800 × 568 pixels. Other resolutions: 320 × 227 pixels | 640 × 455 pixels | 1,024 × 727 pixels | 1,340 × 952 pixels.
Original file (1,340 × 952 pixels, file size: 278 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: 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 |   | View this and other nearby images on: OpenStreetMap |  |
|---|
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
 
|
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.
|
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:20, 23 October 2018 | | 1,340 × 952 (278 KB) | Chetvorno | User created page with UploadWizard |
File usage
The following page uses this file:
