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frame carrying the glass plate are two binding screws at F, to one of which is attached an arm of brass 1, which can so move horizon- Fig. 54.—Diagram showing arrangement of apparatus in the experiment of measuring the rapidity of the nerve-current. For description see text. tally as to establish metallic contact between the two binding screws marked 1, 2. By means of these screws the myograph is interposed in the circuit of a galvanic element and the primary coil I of an induction machine, and the brass arm is so placed as to connect