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    • James Duval Phelan, circa 1910-1920

    • James Duval Phelan, circa 1910-1920

    • Phelan, James D. (James Duval), 1861-1930; Men; Portraits

    • James Duval Phelan was born in San Francisco, April 20, 1861. He graduated from St. Ignatius College (now the University of San Francisco) in 1881 and studied law at the University of California in Berkeley. Phelan became a partner in the banking...
    • Ruhmkorff Induction Coil

    • Ruhmkorff Induction Coil

    • Scientific apparatus and instruments; Induction coils

    • The Ruhmkorff induction coil consists of two separate coils of wire one inside the other wound around a cylinder with a central core of soft iron rods. When a current is passed through the first primary coil, current is induced in the secondary...
    • Ruhmkorff Induction Coil

    • Ruhmkorff Induction Coil

    • Scientific apparatus and instruments; Santa Clara University (Calif.); Induction coil

    • The Ruhmkorff induction coil consists of two separate coils of wire one inside the other wound around a cylinder with a central core of soft iron rods. When a current is passed through the first primary coil, current is induced in the secondary...
    • Kinnersley's Thermometer

    • Kinnersley's Thermometer

    • Scientific apparatus and instruments; Santa Clara University (Calif.)

    • The Kinnersley's Thermometer was an apparatus designed to demonstrate the heating power of an electric spark by showing the expansion of air when an electric spark is passed through it.
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