The American Electro Magnetic Telegraph With the Reports of Congress, and a Description of All Telegraphs Known, Employing Electricity or Galvanism

"The American Electro Magnetic Telegraph" by Alfred Vail is a historical science book that explains how the electro magnetic telegraph works and why it's important for communication, especially when used with the postal service. Vail wants to give readers a complete understanding of the telegraph, focusing on new American inventions and improvements. In the beginning, Vail explains that he wants to describe the American Electro Magnetic Telegraph completely because many people have asked him about how it works. He also mentions that he will include reports from Congress. The book then begins to looks at how things like the battery, electro magnet, and message sending parts work together, with a goal to show how powerful the American telegraph system is when compared to European systems.