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ALippmann electrometer is a device for detecting small rushes ofelectric current and was invented byGabriel Lippmann in 1873.[1]The device consists of a tube which is thick on one end and very thin on the other. The thin end is designed to act as acapillary tube. The tube is half-filled withmercury with a small amount of dilutesulfuric acid above the mercury in the capillary tube. Metal wires are connected at the thick end into the mercury and at the thin end into the sulfuric acid.
When the pulse of electricity arrives it changes thesurface tension of the mercury and allows it to leap up a short distance in the capillary tube. This device was used in the first practicalECG machine which was invented byAugustus Desiré Waller.
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