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Alexander Graham Bell Patent – Telephonic Telegraph Receiver (No. 178,399), June 6, 1876

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This is a patent document for Alexander Graham Bell’s invention, titled "Telephonic Telegraph Receiver," with patent number 178,399, granted on June 6, 1876. The document includes technical diagrams illustrating different components of a telephonic telegraph receiver, an early electrical sound transmission device. The figures detail a mechanical setup for receiving telegraph signals, including electrical circuits and transmitter/receiver components.
Alexander Graham Bell Patent – Telephonic Telegraph Receiver (No. 178,399), June 6, 1876 picture number 1

This patent is an important step in Bell’s pioneering work on the telephone. The telephonic telegraph receiver was part of early experiments with sound transmission over electrical wires, forming the foundation of the first practical telephone systems. Bell’s research and inventions led to the establishment of the telephone industry, revolutionizing global communication.

The Lewis H. Latimer Papers (1870-1929, 1972) [QPL Subgroup]Latimer Family Papers (1870-1996 ) [QPL Full Collection]

Header: "A. G. BELL. TELEPHONIC TELEGRAPH RECEIVER. No. 178,399. Patented June 6, 1876." Technical Diagram Labels: "Fig. 1" (Depicts a side view of the telegraph receiver mechanism) "Fig. 2" (Shows a circuit configuration for signal transmission) "Fig. 3" (Illustrates another electrical signal transmission method) Signatures: Inventor: Alexander Graham Bell Witnesses: Gardiner G. Hubbard, W.J. Root