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    • Spark Discharge Device, circa 1870-1890

    • Spark Discharge Device, circa 1870-1890

    • Electric discharges; Scientific apparatus and instruments

    • When connected to a power source, a bright electric spark would flash between the two ends of the two outer posts. The middle glass post is made of photo gray glass (yellow tinted glass), which would have glowed. This instrument is visible in early...
    • Silicon Valley History Online
    • Spark Discharge Device

    • Spark Discharge Device

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

    • When connected to a power source, a bright electric spark would flash between the two ends of the two outer posts. The middle glass post is made of photo gray glass (yellow tinted glass), which would have glowed. This instrument is visible in early...
    • Claravision
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