[NUMBER 24. VOLUME VIII.) — tree, and inserting therein a series of levers THE Scientific American, and friction rollers, which being operated by CIRCULATION 17,000. a screw are made to expand the tree whilst PUBLISHED WEEKLY … paper, and let it lie for two days in a mode- is a slide, k, fitted in a groove on the top of a_water wheel, by belts, D D, which ro- The annexed engraving is a perspective rately warm place, in summer a dry and airy the tree. This slide has a graduated edge, tate the shafts, C C, on opposite…
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