File:20111110-OC-AMW-0038 - Flickr - USDAgov (1).jpg
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| Description |
English: Farmer in 1923 listening to crop reports broadcast from Washington D.C. using a crystal radio. The early crystal radio had a "cat whisker detector" consisting of a fine wire on an adjustable arm that touched the surface of a crystal of the mineral galena, which had to be adjusted before each use. The user poked the "cat's whisker" wire around on the crystal surface until the device began working and the radio station was audible in the earphones. The information farmers heard through their earphones helped them decide what crops to raise and when to sell. |
| Date | |
| Source | 20111110-OC-AMW-0038 |
| Author | U.S. Department of Agriculture, Photo courtesy of National Archives and Records Administration. |
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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
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- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
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This image was originally posted to Flickr by USDAgov at https://www.flickr.com/photos/41284017@N08/6510702451. It was reviewed on 25 December 2011 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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This image or file is a work of a United States Department of Agriculture employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:11, 25 December 2011 | | 4,444 × 3,398 (6.64 MB) | BotMultichillT (talk | contribs) | {{Information |Description=Farmers poked the "cat's whisker" of their crystal sets around on a piece of quartz until they picked up the crop reports and then listened intently. The information they heard through their earphones helped them decide what to |
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