PICT:0469222/IV/1 Perforated telescoping tubes 1, 2 on which bobbins or cops with compressible cores are threaded for liquid treatment, such as dyeing, are made so that there are free liquid-circulating passages between the overlapping portions of the tubes communicating with the perforations 3, 5 in both the tubes. This may be done by making one of the tubes of elliptical form, or of regular or irregular polygonal form, or, as shown, of general circular shape with a corrugated outline. Specification 427,953 is referred to.
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