oe ee ee ere eee YY a a NY, ® LNUMBEK 27. VOLUME VII1.} —— THE Scientific American, CIRCULATION 17,000. Figure 2. PUBLISHED WEEKLY At 128 Falton street, N. Y., (Sun Buildings) … or three hours. Twelve parts of litharge to vv 0, of equal diameter. The reduction of a ed to fitinto the annular space between the The annexed engravings are views of im- three of the sulphate of zinc, are employed, rod on its opposite sides is effected by running peripheries of rollers, A and B.…
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