known phenomenon of the first at one and then at the other corner of the bolt, ++ 6+ _____—_—_- THE SCIENTIFIC AMERICAN IODIDE OF MERCURY under thermic expansion, keeps the bolt in oscilla- As Melde’s experiment BAROMETER. tion. Another feature will be observed. A soldering iron of octagon section… … of vitriol, the next liquid practically available that ap- proaches it in weight. The details of the barometer are shown in the cut. It was constructed for and stands in the SCIENTIFIC AMERICAN Offices. The tube is in one piece, and is about 2g in. internal diameter. At its upper end it expands so…
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