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Subject Electric apparatus and appliances Remove constraint Subject: Electric apparatus and appliances

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  1. Black finished cylindrical casing with three copper electrodes in a line next to product inscription; nickel knob is raised above the cylinder; outer dial goes from 0-15 (but only three digits are visible through its…

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    Instruments for measuring both voltage and amperes of direct electric current.

    • Part of Catalog K: Physical Apparatus for Universities and Colleges
    • 1912-May

    "Parsons' latest improved design, for controlling incandescent lighting circuits, and for demonstrating the laws of series and parallel combinations."