Gregg, J. B. [from old catalog] · Ada, Ohio, The University herald press · leaf 101
tween the knuckles held as in 2. 4. Luminous. In a dark room notice the discharge, (1.)from the combs; (2.) from the combs after a few backwardrotations; (3.) through Geissler tubes. Duration of Spark*—In a dark room, observe the carriers bymeans of the spark. Vary the distance between the… … Geissler Tubes. THE ELECTRIC CURRENT, EXPERIMENT 43. EFFECTS OF CURRENT. Method*—I. Pass a wire carrying a strong current perpen-dicularly through a piece of cardboard, and sift iron filingsover the cardboard.
Physics
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