s of the size of the bore are S. L. D. suggests that the surplus in the Patent Office tance apart that one rib may always be in the cavity, C. driven down to shut off the sand, and the boring is then re- treasury should be devoted to this object, as it properly Upon the surface of the cylinder,… … Powerful Electro-Magnets. are carried in the direction of the arrow, lig. 2, into the cav- pose the editor of the ScrENTIFIC AMERICAN as the first M. Jamin of Paris has exhibited to the French Academy ity, C, the rib in their rear preventing them from returning ‘‘temporary secretary” of the…
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