"All right, then; I'll tell you the best I can. I used to think myself, when I heard father talking about the shears, that they must be something like mother's shears, only with great long blades; but I found I was mistaken. The shears up stairs are about seven feet long; you see they have to be as long as the cloth is wide. They have iron frames, and I guess are five feet high. There is a roller on the back side and another on the front. On the top and front of the machine is a steel plate which runs the whole length of the shear. This plate has a square edge, and the cloth passes over it from one roller to the other. It is drawn tight when it goes over the steel plate, and there is what I believe they call a cylinder that has sharp knives upon it. They call them knives, but they are like strips of sharp steel fastened on to the cylinder. They are 'bout half an inch high, and run the whole length of the cylinder in a spiral way, just the same as I would wind a string round this stick from bottom to top, if every time the string went round it was an inch from where it went round before. "Well, you see--these strips of steel go round like that, only they are a good deal straighter and are 'bout two inches apart. They call these strips the knives and grind them just like any other shears. The way they do this is by running the cylinder the wrong way and holding a piece of stone against them. This gives them a sharp edge. This cylinder is let down so close to the steel plate that there isn't room for the cloth to pass between it and the cylinder without having the face or nap sheared off by the sharp knives of the cylinder that is going round like lightning. That's 'bout all there is to it. Do you get any idea how it works?" "Oh, yes; I think I see how it is. As the cloth passes over the plate one way, the cylinder whirls the other and clips off the nap. I understand now why a knot in the back of the cloth would do so much harm. As it passes over the plate 'twould raise the cloth up so as to cut a hole in the face of it; but when you told me about it the other day I thought a little thing like that didn't amount to much." "Yes, that's right," responded Carl, with a pleased look on finding his explanation had proved successful. "I have told you a little about nearly all the processes of finishing cloth. I may as well tell the rest. Oh, I forgot to tell you how the cloth is brushed. Well, it is done by machinery. The brush itself is a roller about six inches through, and the same length as the shear cylinder. The bristles are put into the roller all over it, so it is just like any brush, only round. The cloth runs on the brushing machine about the same as on the shear, and the brush that is let down on to the cloth revolves with an awful speed--so fast that it appears to be like a smooth piece of iron or wood. I tell you it takes the dust out and straightens out the nap in good shape."