ange, and is marked by a Agency. It consists of a hollow cylindrical retort, A, Fig. series of letters. The lower extremity of the pencil is merely 1, made of iron, with an iron cap, C, ground to fit the top. used for pointing. The disposition of flange and disk will Over this cap there passes a… … and near the cap is a pipe, F, extending a short distance in- the solid cylinder, which is numbered, is an index or travel- tersecting with a perpendicular pipe, G. At the intersection er which projects through the longitudinal slot of the outer of these two pipes the gas and tar separate, the tar…
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