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Lies, Damn Lies and Wonder Woman. Photo courtesy of the National Endowment for the Humanities. It's been widely acknowledged that William Moulton Marston invented the systolic blood pressure test (eventually developed into the lie detector) in addition to creating superhero character Wonder Woman. Most of the time, articles about Marston are either about the lie detector or Wonder Woman, but not both.
However, it was Samuel Morse (1791-1872) that successfully exploited the electromagnet and bettered Joseph Henry's invention. Morse made sketches of a  magnetized magnet  based on Henry's work. Morse invented a telegraph system that was a practical and commercial success.amuel Morse. While a professor of arts and design at New York University in 1835, Samuel Morse proved that signals could be transmitted by wire. He used pulses of current to deflect an electromagnet, which moved a marker to produce written codes on a strip of paper-the invention of Morse Code.