Hardware merchandising March-June 1917 . t describing a very sim-ple yet strong double lock, which whencomplete, and the raised double edgeturned over and soldered, makes a neat job. A shows an enlarged section of thefinished seam. Fig. 7 is another type of duct gener-ally made on heavy material and rivet-ed; the joints can be made very rigid,and stand in place by using angle iron. Fig. 8 is a rather uncommon type ofduct; the joints are made by using aturned slip piece, which holds the twosections together. The joints can bestaggered if required, and short piecesof material can be used. Fig. 9
Hardware merchandising March-June 1917 . t describing a very sim-ple yet strong double lock, which whencomplete, and the raised double edgeturned over and soldered, makes a neat job. A shows an enlarged section of thefinished seam. Fig. 7 is another type of duct gener-ally made on heavy material and rivet-ed; the joints can be made very rigid,and stand in place by using angle iron. Fig. 8 is a rather uncommon type ofduct; the joints are made by using aturned slip piece, which holds the twosections together. The joints can bestaggered if required, and short piecesof material can be used. Fig. 9 shows a style that can be usedvery advantageously where a warm airduct has to pass up through a room onthe outside of a wall. There are nojoints visible, the corners being made ofround tube. Fig. 10 shows how the joints of warmair heating or fan ducts can be connect-ed together, a piece of asbestos or othermaterial used that will tend to deadenthe sound, as well as make the connec-tions fairly well air tight. (Continued in next issue).. F/G 6 A
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Keywords: ., bookcentury1900, booksubjectbu, booksubjectimplementsutensilsetc
