. Canadian foundryman (1921). on-nected with the pipe that leads the airto the forge. When one skin is full ofair, the operator puts his weight on thatfoot and forces the air into the pipe lead-ing to the fire, when his weight is re-moved from the other skin he pulls acord Which refills it with air through ahole in the top of the bag, which whenfilled is clsed by the operators bareheel, his weight is now shifted to thatfoot, and the air is expelled through thepipe as before. The first skin is nowbeing filled by the same process, and asthe bags alternately are filled and ex-hausted, a fairly co
. Canadian foundryman (1921). on-nected with the pipe that leads the airto the forge. When one skin is full ofair, the operator puts his weight on thatfoot and forces the air into the pipe lead-ing to the fire, when his weight is re-moved from the other skin he pulls acord Which refills it with air through ahole in the top of the bag, which whenfilled is clsed by the operators bareheel, his weight is now shifted to thatfoot, and the air is expelled through thepipe as before. The first skin is nowbeing filled by the same process, and asthe bags alternately are filled and ex-hausted, a fairly continuous blast waspossibly obtained. The invention of the bellows valvein the fourth century which would au-tomatically open and close with the riseand fall of the bellows, made possiblea blast of greater volume and powerthan had heretofore been obtained, es-pecially when operated by wind or waterpower. The Catalan Forge For a thousand years or more theCatalan forge was the most importantand effective contrivance used for the. Figr. 2—Water Blast or Trompe and CatalanForge. making of iron and steel. It is supposedto have originated in the Pyrenees,where even to this day in remote dis-tricts it is still used. And in some formor design it has been known and usedwherever the iron industry has beencarried on. In its simplest form asshown in Figure 1 it consists of roughmasonry in which was made a rectan-gular hearth of stone tapering slightlyto the Ibottom, and supported on a stonearch. The hearth was lined with re-fractory blocks and clay, and the bottom,slag mixed with sand, on which charcoalwas spread, and lighted, the hearth wasthen charged with charcoal and roastedore. The blast was furnished by a handoperated bellows through a tuyere at theside of the hearth. An ingenious blowing device that waslater used when a sufficient supply ofrunning water was obtainable for itsoperation is the water blast, or trompeshown in Figure 2. The drawing illus-trates the water blower as appli
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
