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The device was a system of levers hooked to a scale-pan in which weights were placed to determine the amount of external pressure needed to stop blood flow in the
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published a description of a modified sphygmograph. This modified version made the sphygmograph quantitative, so that it was able to measure
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The sphygmograph : its history and use as an aid to diagnosis in ordinary practice (1882).
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in the mid-19th century. It was developed in 1854 by German
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A sphygmograph, probably of
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303:Drawing of Vierordt's Sphygmograph.
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229:improved it further, and
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