Cotton, pickers, cotton cards, drawing rolls, railway heads and drawing frames, combers, fly frames

 
9781130174885: Cotton, pickers, cotton cards, drawing rolls, railway heads and drawing frames, combers, fly frames

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...glass should show an unbroken surface with no cracks on it. 13. Mefhod of Putting on Leather Covering. When placing the leather covering on rolls, the skins are cut up into strips rather wider than the boss of the roll so as to allow for burning off the ends. The strips are next cut into small pieces just sufficient to fold around the boss of the roll, and their ends are beveled so as to make a joint that will not be perceptible to the touch. Beveling machines are used for cutting the bevel, the skin being placed in the machine so that the knife enters at the flesh side. The beveled ends are next joined together with cement, great care being taken in performing this operation. The leather tube, or cot, is placed in a press for a short time in order to insure a perfect joint. Hand or power presses are now constructed in which cots may be made and pressed. The next operation is to draw the cot over the boss of the roll--an operation somewhat similar to drawing the finger of a glove on the finger. The roll is then revolved at a high rate of speed and any part of the leather that projects over the boss is burned off by friction with a hard piece of wood. The charred portion of the skin forms a collar at the ends of each boss. With long rolls it is difficult to make a cot of exactly the same diameter throughout and draw it on the roll with the same tension in every part. This difficulty is overcome by some roll coverers by taking a long strip of leather and winding it around the roll spirally, attaching it with cement as they wind it on. The skins in this case are cut into strips from 1 inch to li inches wide. The extra cost of covering and the extreme care that is necessary in order to keep the roll true are the disadvantages of this method. It is also claimed ...

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