Elementary treatise on the finishing of white, dyed, and printed cotton goods . nned, but even then the metalbecomes oxydized and the spots reappear. Roofs made of galvanized iron sheets are morerecommendable. The sheets are first folded so asto form two half circumferences, soldered are placed in a slanting position and pro-vided with a gutter through which the water flowsaway. None of these systems prevent condensationnor iron-mould and wood stains which are moreliable to be formed in damp weather. Doublechimneys have also been tried, they are formedof planks covered with felt,
Elementary treatise on the finishing of white, dyed, and printed cotton goods . nned, but even then the metalbecomes oxydized and the spots reappear. Roofs made of galvanized iron sheets are morerecommendable. The sheets are first folded so asto form two half circumferences, soldered are placed in a slanting position and pro-vided with a gutter through which the water flowsaway. None of these systems prevent condensationnor iron-mould and wood stains which are moreliable to be formed in damp weather. Doublechimneys have also been tried, they are formedof planks covered with felt, and then recoveredwith wooden planks. The final result in howeveralways the same, and in spite of all these diffe- MACHINES EMPLOYED IN FINISHING. 135 rent systems drops of condensed water cannot beavoided. Ventilators are now used in preference asthey remove the steam and renew the air at thesame time. They are fixed in various 25, page 135, represents a ventilator, fittedto the rafters of the roof, the air escaping througha chimney placed in a vertical Fig. 25. Ventilator fitted to the roof. Fig. 26, page 137, represents a ventilatorfixed to the ceiling and having an outlet throughthe side of the room. These different apparatuseswork by means of a strap, driven by a pulleyfixed on the principal shaft of the workshop. Fig. 25B, page 136, represents a Blackmanair propeller applied to a drying machine. It isone of the best and cheapest in the market; isvery easily applied and gives excellent results. —
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Keywords: ., bookcentury1800, bookdecade1880, bookidelementarytr, bookyear1889
