File:Detail showing Bell's liquid transmitter in a drawing by P.D. Richards of the experiments in early 1873.jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Summary[edit]

Description
English: P.D. Richards, Bell's friend and neighbor, wrote the inventor a letter on November 9, 1874 describing the transmission of telegraphic messages over wires using a liquid transmitter filled with mercury. This is a detail of the drawing included with the 1874 letter, which is in the Library of Congress
Date
Source Library of Congress
Author Alexander Graham Bell

35 West Newton Street, Boston, MA

Licensing[edit]

Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or less.


This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.

File history

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

Date/TimeThumbnailDimensionsUserComment
current17:28, 22 November 2014Thumbnail for version as of 17:28, 22 November 2014359 × 300 (17 KB)Heritager (talk | contribs)User created page with UploadWizard
  • You cannot overwrite this file.

File usage on other wikis

The following other wikis use this file: