. Transactions . s required not only in making them,but also in putting them together. The plug, Fig. 14, is made inan iron ring which was formerly made at the Northeastern worksin two pieces, and held together by three or four lugs welded to is now made of a single piece and held together by three linkswhich fit over the lugs, and makes a much simpler construction, asit is quickly removed from the plug after it is burned and is readily 484 BASIC REFRACTORY MATERIALS. adapted again for anew plug. A square bench, Fig. 15, with a cir-cular hole in the center the size of the ring, and made
. Transactions . s required not only in making them,but also in putting them together. The plug, Fig. 14, is made inan iron ring which was formerly made at the Northeastern worksin two pieces, and held together by three or four lugs welded to is now made of a single piece and held together by three linkswhich fit over the lugs, and makes a much simpler construction, asit is quickly removed from the plug after it is burned and is readily 484 BASIC REFRACTORY MATERIALS. adapted again for anew plug. A square bench, Fig. 15, with a cir-cular hole in the center the size of the ring, and made in two partsso as to be easily removed, is placed around it for the men to workon. This ring is set upon a bottom-plate of cast-iron, Fig. 14,which is filled with holes corresponding to the tuyeres. The numberof these holes varies in different works and varies also with the sizeof the converter. At the Rhine works there are 45 of them diameter. At Glengarnock there are 56, and at the Northeastern Fig. 15. WOODEN PLATFORMAROUND MOULD works there are 62, which are in diameter. These holes areregularly distributed in the plate. Through them iron rods withheads to prevent their coming through the plate, of the same diame-ter and a little longer than the length of the tuyere, are cast-iron plate with the rods in the holes is placed upon a sup-port so that the heads of the rods cannot fall out (Fig. 14), andthe ring placed on it so as to leave the cast-iron plate projecting BASIC REFRACTORY MATERIALS. 485 to beyond it. The ramming is shoveled into thering and pounded with the stampers, in the same way as for themanufacture of the brick, only as the piece is much larger and thereare to be holes in it, much greater care is required in making it. At first the same stampers were invariably used for making thering and plug which were used for making the bricks. It was thenfound that the abrasion by the blast was very great because thepoint where the
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
