In the 1890s, when technologies like telephones and automobiles and lightbulbs were still strange and wonderful and new, inventors promised another remarkable device would soon be ubiquitous: the mind-reading machine. Inspired by the phonoautograph—a new device that showed what sound waves looked like on paper—the scientist Julius Emmner invented a machine that he said could record thoughts. It was simple, really. If invisible sound vibrated in a ways that could be measured, Emmner figured, why wouldn't unseen thoughts do the same? "Sound is addressed to the ear," he told The Times of Washington, D.C., in August 1895, "yet it may be made visible, a proof of which fact is found in the phono-autograph, in which the vibrations of sound are made distinctly visible." Reporters took him at his word. From that same article: "Mr. Emmner is carefully guarding his secret, but he speaks so enthusiastically of his success that he must have obtained the most satisfactory results so far from his investigations." Reports of thought-reading machines were common in those days. "Secrets will cease to be hidden in the day when the perfected psychometer comes into general use," the Seattle Star declared in a 1908 article about Columbia University professor Frederick Peterson's lie-detector-esque "mind-reading machine." Read the details via The Atlantic.
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