Jump to content

File:Magneto wall telephone 1917 open.jpg

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (1,518 × 1,380 pixels, file size: 215 KB, MIME type: image/jpeg)

Summary

Description
English: Early magneto wall telephone manufactured in 1917 by Julius Andrae and Sons Co., Milwaukee, Wisconsin, USA from an advertisement in a telephone trade magazine. Shown with case open revealing internal parts. Magneto for ringer is seen above the cylindrical batteries. Magneto telephones were "local battery" instruments; power for the transmitter was provided by dry cell batteries in each telephone, which had to be replaced periodically. These were superseded by modern "central battery" systems, in which all the power for the phone was provided by the local switching office.

Alterations to image: Cropped out surrounding advertising copy and partially removed aliasing artifacts (crosshatched lines) added by scanning of halftone photo, using Gimp FFT filter.
Date
Source Retrieved October 20, 2014 from Telephony magazine, Telephony Publishing Co., Chicago, Vol. 73, No. 10, September 8, 1917, p. 33 on Google Books
Author Unknown authorUnknown author

Licensing

Public domain
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, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
United States
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.
Annotations
InfoField
This image is annotated: View the annotations at Commons

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

inception

8 September 1917Gregorian

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current15:38, 21 October 2014Thumbnail for version as of 15:38, 21 October 20141,518 × 1,380 (215 KB)ChetvornoUser created page with UploadWizard

Global file usage

The following other wikis use this file:

Metadata

This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.

If the file has been modified from its original state, some details may not fully reflect the modified file.

Retrieved from "https://en.wikipedia.org/wiki/File:Magneto_wall_telephone_1917_open.jpg"