t of mercury to escape, when thetube is vertical as before. It is closed and tilted, allowing the bubble to again gather air. This operation isrepeated two or three times. The tube is finally in-verted and filled with mercury, so as to present aconvex surface above the open end of the tube.… … THE BEAUMONT OIL WELL. the bottle and the tube may now be inverted together,and after putting a little mercury in the bottle, th?latter may be placed on the shelf prepared for it, andthe tube may be raised a little, so as to clear its openend from the wax, and the tube is fastened in placeby…
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