United States National Museum, Smithsonian Institution, United States. Department of the Interior · Washington : Smithsonian Institution Press, [etc.]; for sale by the Supt. of Docs., U.S. Govt Print. Off. · leaf 321
Figure 30. — Morse’s canvas-stretcher receiver {top) and port- rule transmitter of 1837. It is difficult to fix the date of actual construction of this apparatus. Morse gave it to Western Union at some time prior to his death in 1872, and Western Union gave it to the Smithsonian Institution in…
Science
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
