Mechanical Contracting & Plumbing January-December 1908 . s in diam-eter than the inside diameter of thepipe. The core is made by jjlacing the corearbor in a machine which consists of asemi-circular support for the ends ofthe arbor, a shaking screen arranged tosift sand a guide to drop it upon thearbor, and a knife. The arbor is wetthoroughly and i-otated while the sandfalls and clings to it. The surplus sandis scraped away by the knife, placed atthe proper distance from the arbor tomake the finished core of the diameterand shape required, and it is ready foruse. A freezing apparatus, consisti
Mechanical Contracting & Plumbing January-December 1908 . s in diam-eter than the inside diameter of thepipe. The core is made by jjlacing the corearbor in a machine which consists of asemi-circular support for the ends ofthe arbor, a shaking screen arranged tosift sand a guide to drop it upon thearbor, and a knife. The arbor is wetthoroughly and i-otated while the sandfalls and clings to it. The surplus sandis scraped away by the knife, placed atthe proper distance from the arbor tomake the finished core of the diameterand shape required, and it is ready foruse. A freezing apparatus, consisting of adouble wall tin vessel with a capacityof 5 gallons or more, is reported byConsul Robert J. Thompson, Hanover,Germany. There is a hollow space be-tween the two walls—that is, betweenthe inner and outer vessels. This spacecompletely surrounds the inner com-partment and is about an inch in the graduated admission of carbonicacid to this surrounding chamber at thebottom of the vessel, and from this sur-rounding chamber into the vessel pro-. not only survive the process but would direction opposite to the required mo- also produce castings that would bemarketable and could be easily ma-chined. This dream, as far as the east-ing of water and gas pipe is concerned,has been realized, according to PopularMechanics. The machine by which it is accom-plished consists of a table or ring ap-proximately 40 feet inside diameter,carrying 30 molds, arranged at equalintervals. The table is constructedof two concentric rings of channelbeams, connected with 32 cross-piecesor trucks, each of which has twowheels which run on concentric circulartracks set in concrete foundations. Un-der ithe table or ring, at two diametri-
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