The Artizan . , and no inequalities be presented to form a nucleus for the deposit ofsolid matter; 4th. To have as perfect a system of jointing as possible. The method of casting pipes on end in dry sand moulds, socket down, has forsome years past been made an essential in most specifications for large advantage to be gained from this mode is, to have all the scoria and otherimpurities in the metal floated to the top and allowed to lodge in a piece of thepipe which is afterwards cut off, the pipe being made 12in. to 16in. longer for thispurpose. By this mode of manufacture the socket
The Artizan . , and no inequalities be presented to form a nucleus for the deposit ofsolid matter; 4th. To have as perfect a system of jointing as possible. The method of casting pipes on end in dry sand moulds, socket down, has forsome years past been made an essential in most specifications for large advantage to be gained from this mode is, to have all the scoria and otherimpurities in the metal floated to the top and allowed to lodge in a piece of thepipe which is afterwards cut off, the pipe being made 12in. to 16in. longer for thispurpose. By this mode of manufacture the socket is left solid, in fact it is themost solid part of the pipe. Fig. 1 shows a section of the mould for a 40in. pipe being cast in this way,with an improved core-bar. A A is the core-bar barrel, attached to a bottomplate B B, having its circumference C C turned to fit into a similar turned partin the plate on which the moulding-box F F is fixed. D D is sand forming thecore, E E the sand forming the It is usual in casting pipes, socket down, to make the core in two parts, oneto form the barrel of the pipe, the other the socket. The socket part being firstput into its position in the mould, the barrel part is lowered into its positionover it. There is no means of getting at this joint to make sure that it is goodbefore the pipe is cast, so that any inaccuracy in the setting remains undetecteduntil it is too late to rectify it. With the core-bar here shown the core is made entirely in one piece. It isput in position in the mould, by being drawn up through it from a pit beneath,and accuracy in setting is provided for by means of the turned bottom-plateB B on which the bar is fixed, the turned part C C fitting into a recess, also The Abtizax,] May 1,1865. I Improvements in the Manufacture of Cast Iron Pipes. Ill turned out in the carriage on which the uaoulding-box is fixed. The mould andcore being made concentric with these guiding surfaces, the casting cannot failto b
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
