In some instances, when the paper being made is sized in the pulp with such an ingredient as _resin_, the felt becomes so completely clogged in the space of a few hours, that unless a very great and apparently unnecessary length of felt be employed, a considerable waste of time is constantly incurred in washing or changing the felt. To obviate all this—whether waste of time or waste of felt—I have suggested in one or two quarters, the propriety of passing the felt, as it returns from conducting the paper to the heated cylinders, through a trough of water, and while travelling through the water to apply suction boxes to both the upper and lower surface of the felt, which by an alternate action, might be made sufficiently powerful to remove all impurity, without in any way obstructing the progress of the felt; which if found necessary, might be assisted, while at the same time the felt would be restored to its original condition, by employing a suction _roller_ to which a steady motion was given in connexion with the machine. The operation of the manufacture will now be apparent. The pulp flowing from the reservoir into the lifter, and thence through the strainer, passes over a small lip to the continuous wire, being there partially compacted by the shaking motion, more thoroughly so on its passage over the air boxes, receiving any desired marks by means of the dandy roller passing over the continuous felt between the first pressing rollers, then turned over to receive a corresponding pressure on the other side, and from thence off to the drying cylinders, which are heated more or less by injected steam; the cylinder which receives the paper first, being heated less than the second, the second than the third, and so on; the paper after passing over those cylinders, being finally wound upon a reel, as shown, unless it be printing paper, which can be sized sufficiently in the pulp, by an admixture of alum, soda, and resin, or the like; in which case it may be at once conducted to the cutting machine, to be divided into any length and width required. But, supposing it to be intended for writing purposes, it has first to undergo a more effectual method of sizing, as shown in the accompanying drawing. The size in this instance being made from parings obtained from tanners, curriers, and parchment-makers, as employed in the case of hand-made papers. Of course, sizing in the pulp or in the engine offers many advantages, but as gelatine, or animal size, which is really essential for all good writing qualities, cannot at present be employed during the process of manufacturing by the machine without injury to the felts, it becomes necessary to pass the web of paper, after it has been dried by the cylinders, through this apparatus. [Illustration: SIZING APPARATUS]