Marconi Type 106 crystal radio receiver



This photo was viewed 1 times and was downloaded in full size 0 times.

This photo was liked 0 times

Please login in order to see the source link


English: Marconi Type 106 radio receiver, a crystal radio receiver made from 1915 through the 1920s by the American Marconi Co. The Type 106 went through many design changes. This example was probably a Type 106C, which came out in 1921. It's tuning range was 3500 to 200 meters (86 to 1500 kHz). The crystal "cat's whisker" detector is visible between the lower center and right knobs. This sophisticated inductively-coupled receiver could receive Morse code transmissions from powerful spark gap transmitters from thousands of miles away, across oceans.
Information from Douglas, Alan (2006(2006)). Radio Manufacturers of the 1920s. United States: Sonoran Publishing. pp. 56. ISBN 1886606048 .. The crosshatching in the image is an aliasing artifact of scanning the original halftone picture.
Date 1921(1921)
Source Downloaded 2010-03-16 from Elmer Eustice Bucher (1921) Practical Wireless Telegraphy, Revised Ed., Wireless Press Inc., New York, p.151, fig.170 on Google Books
Author Elmer Eustice Bucher
(Reusing this file)

Public Domain in USA - published prior to 1923 in USA


Public domain
This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1923. See this page for further explanation.
United States
This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

Public Domain


Only registered users can post comments. Please login

EXIF data:
File name marconi_type_106_crystal_radio_receiver.jpg
Size, bytes 59321
Mime type image/jpeg
The images at Free-Photos.biz come mainly from Wikimedia Commons or from our own production. The photos are either in the public domain, or licensed under free linceses: Free-Photos.biz license, GPL, Creative Commons or Free-Art license. Some very few other photos where uploaded to Free-Photos.biz by our users and released into the public domain or into free usage under another free license (like GPL etc.)

All photos in average size can be saved by everyone without registration (by right-clicking) - and all photos can be downloaded in full-size and without the big watermark by members (by left-clicking) (registration and free membership required).

While the copyright and licensing information supplied for each photo is believed to be accurate, Free-Photos.biz does not provide any warranty regarding the copyright status or correctness of licensing terms. If you decide to reuse the images from Free-Photos.biz, you should verify the copyright status of each image just as you would when obtaining images from other sources.

The use of depictions of living or deceased persons may be restricted in some jurisdictions by laws regarding personality rights. Such images are exhibited at Free-Photos.biz as works of art that serve higher artistic interests.

christianity portal