engraving, which we take from RUSSIAN POTTERY. Recent Engineering Inventions. the English Mechanic. The upper part consists, first, of a We present engravings of two examples of unglazed Rus- Mr. William P. Barclay, of Virginia City, Nev., has pat- screw, S, at the top, Fig. 1; secondly, of a ented… … portionate to the size of the hole to be drilled. wells without disturbing the tubing or valves. Near to the lower end or cutting edges of the It consists in the arrangement of the upper drill is fixed rigidly a metal guide bar or plate, valves in connection with the cell containing F. The guide…
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