. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . are made they are put in a metal box or flask, and an iron followeremjDloyed to press and hold the moulds firmly together by means of the set screws, as illustratedin Fig. 3001, just as the style of the machine may be, so as to resist the pressure of the injectedmetal without parting at the joints. When this is done the cylinder or injecting vessel J is pro-vided on the inside with a non-conducting lining. The lining of the cylinder is performed as follows
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . are made they are put in a metal box or flask, and an iron followeremjDloyed to press and hold the moulds firmly together by means of the set screws, as illustratedin Fig. 3001, just as the style of the machine may be, so as to resist the pressure of the injectedmetal without parting at the joints. When this is done the cylinder or injecting vessel J is pro-vided on the inside with a non-conducting lining. The lining of the cylinder is performed as follows ;—Take some fine fire-proof clay or kaolin freefrom sand grit, and thoroughly blend the same with about one-half the quantity of good plumbago ;then mix with water so as to form a paste. The cylinder is heated to about 200° of Fahrenheit,and with a brush the aforesaid paste is applied on the inside of the cylinder to a uniform thicknessof about \ of an inch, the heat of the iron cylinder di-ying the paste as applied. This done, thecylinder is further heated to evaporate all moisture from the lining, and is then ready for further. 1546 FOUNDING AND CASTING. operation. The surface of the piston K coming in contact with the fluid metal is coated in a similarmanner. This lining of the cylinder serves several useful purposes ; it serves to pack the space orjoint between the cylinder and piston, and prevents the intrusion of the metal between the two,which intrusion would certainly and rapidly clog their parts and stop the operation, as the heat ofthe fluid metal will at once expand the cylinder more than the piston, and admit the metal betweenthem at the joint. It should be explained that the plunger or piston K fits the cylinder, and istherefore larger than the internal diameter of the lining, and that at every operation the cylindermust be relined or recoated, as such lining is detached from the cylinder J, and pushed in advanceof the piston K at every forward movement of the l
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
