mounting the dyeing head 12 by means of mounting bolts not shown by loosening the mounting bolts and manipulating an adjustment screw 27 fig2 the height of the head 12 may be adjusted to increase or decrease the height of the head 12 relative to the yarn 13 each slot 22 includes a liquid supply conduit 24 which supplies the dye upwardly into the slots 22 such that the slots 22 are constantly supplied with the dye in the embodiment shown in fig4 to 6 the supply conduits 24 are alternatingly staggered thereby allowing the supply conduits 24 to be formed of a sufficient size constantly to flood the slots 22 while increasing the structural integrity of the dyeing head 12 in this embodiment the supply conduits 24 are formed with a diameter of 0 05 to 0 12 inches preferably 0 07 to 0 09 inches depending on the viscosity of the dye or coating material the slots 22 may be formed of a sufficiently small width 21 e g 0 015 inches such that the dye is constantly maintained within the entire length of the slots 22 by capillary action instead as in this embodiment a pump may be controlled to supply the appropriate amount of dye to replenish the slots 22 at the same rate as.