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A rare 1881 mechanism which records
the pulse pressure at the wrist. A sensitive manometer sits on the
radial pulse and is amplified by means of a weighted pulley. A
clockwork mechanism turns a roller which winds recording paper under
the needle to record a trace. The bar under which the paper
traverses has been replaced. There is a stress fracture at the
corner of the main vertical support, which nonethelesss remains
structurally sound. The precursor to the ECG / sphygmomanometer ...
and it still works after 124 years! |
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