FIGURE 6.

other, is in full contact with each surface. Figure 4 gives a view of an individual cell and Figure 5 shows one way in which they may be arranged. It is obvious that they may be grouped in one, two, three, four, or even more tiers. When arranged in tiers, they are so placed that each surface of each cell is substantially tangent to the surface of the cell above and below, or its guide roll. The object of more than one tier is to permit of a compact arrangement, and to keep the size of each cell as small as possible. The cloth is drawn over the cells by guide rolls, part or all of which are driven positively. Steam is admitted to them through openings near the middle of their height. The water of condensation flows off by gravity, the pipe connection being made at the lowest part of the cell, so that each is perfectly drained at all times.

The size of these cells as now built is about 221⁄2 inches high, 4 inches thick at the thickest part, and 43 inches long over all. We have used two methods in the construc

FIGURE 7.

tion of these cells; one is to make them of copper plate with brass heads and internal braces. The other is to make them out of a single brass casting.

Now, as to the manner in which the cells overcome the objection to rotary cylinders, which we have noted:

Ist. There are no journals to pack. This means no loss of

power by friction in stuffing boxes, no cost for packing renewal and attention, no leaking stuffing boxes, therefore no man with a monkey wrench.

2nd. There are no buckets, scoops, or syphons required, since the water of condensation flows out by gravity and the cells are perfectly drained at all times.