Abstract:THE drop-recorder here described is a modified form of that used in the Physiological Laboratory of the University of Edinburgh. It consists of a fine steel spring S, to the free end of which is attached a disc D with the convex side uppermost on which the drops fall. Terminals T1 and T2, in circuit with a battery and recording electro-magnet, are insulated from each other by the vulcanite block V; contact is made and the circuit closed when the spring touches the platinum-tipped adjustable screw P, that is, b… Show more
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