Image: Magneto wall telephone 1917 open

Size of this preview: 660 × 600 pixels. Other resolutions: 264 × 240 pixels | 1,518 × 1,380 pixels.

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

Description: 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 These were superseded by modern "central battery" systems, in which all the power for the phone was provided by the local switching office.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.
Title: Magneto wall telephone 1917 open
Credit: 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
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

Image usage

The following page links to this image:

History of the telephone

All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise.