Image: Phelps' Electro-motor Printing Telegraph
Description: An illustration of Phelps' Electro-motor Printing Telegraph, the last and most advanced telegraphy mechanism designed by George May Phelps.
Title: Phelps' Electro-motor Printing Telegraph
Credit: Google Books - Edward Henry Knight (1884) Knight'S New Mechanical Dictionary; A Description Of Tools, Instruments, Machines, Processes, And Engineering, Houghton, Mifflin and Co., p. 722
Permission: 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. Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. PD-1923 Public domain in the United States //commons.wikimedia.org/wiki/File:Phelps%27_Electro-motor_Printing_Telegraph.jpg
Usage Terms: Public domain
License: Public domain
Attribution Required?: No