of the thread that is not cut as a file operating one of which is hidden by the body of the machine, of which is anannular distributer, its inner surface hav- as agauge to limit the depth of cut made by the file are intended to travel one upon each side of aline of section of the thread. After the… … quantity of silica and a small percentage of vana- The author puts 100 or dium oxide. The formula given by the authors was 50 c. c. in a roomy separat- CaO.P.0s.CaO.SiOz. In addition to the above, erys- ing funnel after acidifying tals of a feather-like form, containing a large percent- with 5c. c.…
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