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Acronyms that contain the term Electro-motograph
What does Electro-motograph mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: Electro-motograph.
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What does Electro-motograph mean?
- Electro-motograph
- An invention of Thomas A. Edison. A cylinder of chalk, moistened with solution of caustic soda, is mounted so as to be rotated by a handle. A diaphragm has an arm connected to its center. This arm is pressed against the surface of the cylinder by a spring. When the cylinder is rotated, a constant tension is exerted on the diaphragm. If a current is passed through the junction of arm and cylinder the electrolytic action alters the friction so as to change the stress upon the diaphragm.
If the current producing this effect is of the type produced by the human voice through a microphone the successive variations in strain upon the diaphragm will cause it to emit articulate sounds. These are produced directly by the movement of the cylinder, the electrolytic action being rather the regulating portion of the operation. Hence very loud sounds can be produced by it. This has given it the name of the loud- speaking telephone.
The same principle may be applied in other ways. But the practical application of the motograph is in the telephone described.
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