First Principles of Natural Philosophy (1897) by Amos Dolbear

Amos Emerson Dolbear (November 10, 1837 - February 23, 1910) was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874. In 1874 he became the chair of the physics department at Tufts University in Medford, Massachusetts.[1] In 1899 one of his patents was purchased in an unsuccessful attempt to interfere with Guglielmo Marconi's activities...
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Amos Emerson Dolbear (November 10, 1837 - February 23, 1910) was an American physicist and inventor. Dolbear researched electrical spark conversion into sound waves and electrical impulses. He was a professor at University of Kentucky in Lexington from 1868 until 1874. In 1874 he became the chair of the physics department at Tufts University in Medford, Massachusetts.[1] In 1899 one of his patents was purchased in an unsuccessful attempt to interfere with Guglielmo Marconi's activities in the United States.