Go back

Alexander Graham Bell Patent – Telegraphy (No. 174,465), March 7, 1876 (Sheet 2)

Drawing
This is the second sheet of Alexander Graham Bell’s patent for Telegraphy (No. 174,465), granted on March 7, 1876. The sheet contains additional technical diagrams, illustrating electrical circuit arrangements and a mechanical communication system. The figures show a multi-unit electrical relay system and an early concept of sound transmission, possibly relating to Bell’s work on multiplexed telegraphy or early telephone technology.
Alexander Graham Bell Patent – Telegraphy (No. 174,465), March 7, 1876 (Sheet 2) picture number 1

This patent represents a crucial step in the development of telecommunications, leading to Bell’s invention of the telephone. The diagrams depict a telegraphic system capable of transmitting multiple signals over a single wire, a key innovation that contributed to early telephone technology. The transmission system in Fig. 7 appears to resemble a primitive telephone setup, emphasizing sound transmission via electrical signals. Lewis H. Latimer may have worked on drawings that were the basis for this patent illustration.

Latimer Family Papers (1870-1996 ) [QPL Full Collection]

Header: "A. G. BELL. TELEGRAPHY. No. 174,465. Patented March 7, 1876. 2 Sheets—Sheet 2." Technical Diagram Labels: "Fig. 6" (Illustrates a system of multiple relays and electrical connections) "Fig. 7" (Depicts a setup resembling an early telephone system, showing sound transmission components) Signatures: Inventor: A. Graham Bell Witnesses: Gardiner G. Hubbard, Thomas Watson