e.The tube is then placed open end up and entirely filledwith mercury. It is then inverted while it is keptclosed by the finger. The end of the tube is placed be-low a body of mercury in a suitable vessel and a littleof the mercury is let out so as toproduce a partial vacuum at thetop. Then the… … SCALE AND INDICATOR. MERCURIALBAROMETER. that may remain. The tube is again inverted andfilled, until it is entirely full of mercury. The fingeris again applied, and a vacuum is produced by allow-ing a small amount of mercury to escape, when thetube is vertical as before. It is closed and tilted,…
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