
spring changes its qualities over time, and so these instruments are less accurate on a long-
term basis. This type of apparatus is depicted in Figure 1.2.
Fig. 1.1: Standard mercury tonometer in a metal case with connected sleeve (cuff) and a
balloon with air relief valve.
Fig. 1.2: Aneroid pressure gauge, in which the mercury manometer was replaced by a spring
watch manometer, again the sleeve (cuff) is connected.
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