. Appleton's dictionary of machines, mechanics, engine-work, and engineering. onstructed of iron, in the best provided works, it has long been impossible toobtain a regularity of motion, and a harmony between the movement of the endless cloth and the feed-ing on of the pulp, so that the paper may possess uniformly the same thickness. From this resulted a serious imperfection, consisting of a marked inequality between the differentparts of the long band of paper, and consequently, between the sheets into which it is cut. We con-ceived that this inequality was not only a fault, but also that it
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. onstructed of iron, in the best provided works, it has long been impossible toobtain a regularity of motion, and a harmony between the movement of the endless cloth and the feed-ing on of the pulp, so that the paper may possess uniformly the same thickness. From this resulted a serious imperfection, consisting of a marked inequality between the differentparts of the long band of paper, and consequently, between the sheets into which it is cut. We con-ceived that this inequality was not only a fault, but also that it exposed the manufacturers to disputesnot arising from any fault on their part. In fact, to cause the velocity of the machines, and consequently, the strength of the paper to vary, itwas enough that the resistances opposed by the materials were not constant, or that the stream of waterhappened to be disturbed. It is to avoid these difficulties and inconveniences that Sandford and Varrall have invented theapparatus represented in Figs. 3007, 3008, 3009, 3010, 3011, and This apparatus consists principally of a wheel K, provided with a certain number of scoops e, whichtake up the diluted pulp, elevate it, and pour it into a receptacle, from which the filter e conducts itinto the vat for working the paper machine. The motion of the wheel U being connected both withthat of the water-wheel, and of (he endless cloth, it is easy to sec that if the receiver accelerates, orretards its motion, in consequence of some variation in the level or quantity of the water above, therapidity of the revolution of the scoop-wheel It, and the motion of the endless cloth of the machine, willeach feel a proportional variation. But as the scoop-wheel for each of its revolutions poms the samequantity of pulp into the filter c of the machine, it is evident that the (ceding on of the pulp will aug-ment, or diminish proportionally to the velocity of translation of the endless cloth, ana that, conse-que
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
