| 摘要 |
A measuring instrument, preferably for determining the mean arterial blood pressure from a graph containing values of systolic pressure and diastolic pressure. The instrument comprises a compass having a pair of outer legs and a single intermediate leg disposed therebetween. The outer legs are arranged to enable the distance between outer ends thereof to be manually varied. A proportioning mechanism maintains an outer end of the intermediate leg at a constant ratio, preferably one-third, of the distance between the outer legs.
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