Tuis instrument consists of: (I) A broad armlet, which is strapped round the upper arm. The armlet is formed of a flexible steel band, on the inside of which there is fastened a bag of thin indiarubber. The rubber bag is connected by a Y-tube with (2) a small compressing air pump fitted with a valve and (3) a pressure gauge. The pressure gauge is of special construction. Roughly, it consists of a metal tambour, the expansion of which is
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Hill et al. (1897) studied this question.