not be of smaller internal diameterthan experience has shown to he necessary. The air-pipes areprovided with perforations on their under-side, not less than |thsof an inch in diameter; and the number of these perforations musthe such that their total sectional area is not less than double that… … Fig. 26.—Com pressed-air agitator. tributed or dissolved into renewed contact with the injected air.When the trough is more than 27 inches wide, a single pipe will nolonger be sufficient, and in such case additional pipes must beprovided at intervals of 20 inches. The diameter of the steamvalve and…
Textile finishing
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