Learn how a pocket watch functions as a telegraph sounder, converting electrical pulses into Morse code sounds in a portable unit.

This so-called "Secret Sounder" is actually a portable telegraph unit made to resemble a pocket watch. Maker: Manufacturers' and Inventors' Electric Co. Location: Currently not on view

The Back of the Pocket Watch Sounder Showing the Name Inscription The Pocket Watch Sounder Was Also Available With an Optional Built-in Tiny Key An Early Advertisement for the Pocket Watch Sounder, Which Was Called The Secret Sounder !

2024年1月30日 · Circa Late 1800, early 1900. Made by Manufacturers and Inventors Electric Co NY. Cool little devise presumably for telegraph linemen to test the lines for ...

Vintage pocket telegraph sounder from 1900 with images and detailed description, possibly a pocket watch sounder. Video showing scratches and cuts.

This small, portable telegraph unit was known (probably generically) as a "secret sounder" and could be attached quickly to a telegraph line for military use or for tests by maintenance crews. Containing both a key and a sounder in a closed box, the unit is associated with US Patent #760029, issued to John F. Skirrow on 17 May 1904.

Telegraph sounders convert electrical pulses into audible sounds and are used to receive Morse code messages. The message travels as a series of electrical pulses through a wire. Short pulses make a dot, slightly longer pulses make a dash. The sequence of dots and dashes represent letters and numbers.

"Circa Late 1800, early 1900. Made by Manufacturers and Inventors Electric Co NY. Cool little devise presumably for telegraph linemen to test the lines for Morse code signal strength. Friend lent this to me to figure out and make it work again. 4 Volts seems to …

This small, portable telegraph unit was known (probably generically) as a "secret sounder" and could be attached quickly to a telegraph line for military use or for tests by maintenance crews. Containing both a key and a sounder in a closed box, the unit is associated with US Patent #760029, issued to John F. Skirrow on 17 May 1904.

This small, portable telegraph unit was known (probably generically) as a "secret sounder" and could be attached quickly to a telegraph line for military use or for tests by maintenance crews. Containing both a key and a sounder in a closed box, the unit is associated with US Patent #760029, issued to John F. Skirrow on 17 May 1904.