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Communication

Wireless Maritime Warning Signaler

WIRELESS TELEGRAPHY FOR THE PREVENTION OF SHIPPING DISASTERS.

Photographophone Receiver

Photographophone Receiver

The receiver included a selenium cell with two telephone receivers.

Photographophone Casing Open

Photographophone Casing Open

Shown is a wooden light blocking case around the photographic film reels.

The Photographophone 1901

THE " PHOTOGRAPHOPHONE."
BY ERNST RUHMER.
The SCIENTIFIC AMERICAN has from time to time presented to its readers different methods of recording and reproducing both musical sounds and human speech.Photographophone Casing Open: Shown is a wooden light blocking case around the photographic film reels.Photographophone Casing Open: Shown is a wooden light blocking case around the photographic film reels.

Photographophone Casing Open

Light tight wooden casing around the photographic film reels.

Dolbear's New Telephonic System, Front Page Wood engraving

Dolbear's New Telephonic System, Front Page Wood engraving

Front page wood engraving of the June 18, 1881 Scientific American weekly journal.
Title: Professor A. E. Dolbear's New Telephonic System

Dolbear's New Telephone System

A NEW TELEPHONE SYSTEM. Scientific American New York June 18, 1881
Dolbear's New Telephonic System, Front Page Wood engravingDolbear's New Telephonic System, Front Page Wood engraving

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