The Locomotive Of Today

The Boiler: Regulators. 37 o reversing levers, but arranged horizontally, and in these notches a catch engages. At E is shown a regulator fixed in the smokebox on the front tube plate, and to it the steam is conducted by means of the internal pipe described earlier ; in this form two ports are cirrangeel lengthwise of the engine covered by a valve riding crosswise, so that to open them the movement of the handle is exactly similar to those shown at A, B and C. This class of regulator is not always provided with a relief valve, as more leverage is available ; but it has the disadvantage that the long connecting- rod to the handle is liable to twist. At F another arrangement fixed in the same position on the boiler as the last is shown, but in this case the ports are arranged transversely, and covered by a valve with a large port and two smaller ones ; above this is a riding or pilot valve with similar openings. The handle in this case is of the “pull out” form, and in operation the first movement opens the small ports, then the projection upon the small valve engages the larger one and moves the two together until the large port in both valves allows steam to pass into one port of the head, and also to pass by the front end and so down the other one. The end of the rod is provided with a stuffing box, so that the weight of it may not rest on the valves, and also the valves may not be lifteel from their face without lirst removing the cover plate. The joints at the regulator end of the internal steampipes for the designs at A, B, C and D are all coned, the casting being turned and the pipe, which is generally of copper, having a brass cone with a shoulder brazed upon it, a band of iron, or more properly, two half bands are placed round it and behind the shoulder, the bolts uniting the two half bands pass through an eye formed at the end of two bolts, which pass through holes in lugs on the regulator casting; screwing up the nuts on these bolts will cause the brass cone to be forced tightly into the cone of the regulator. A slight modification is shown at C; here, instead of the bands the bolts have hooked ends which are placed behind the shoulder, and tight- ening the nuts pulis the cone home. The joints at the tube plate end for the above are made by belling the pipe out to fit the hole in the tube plate, which hole must be large enough to allow for the passage of the cone and shoulder at the other end of the pipe, and then driving a ring of Steel turned accurately to size into it, and making a joint similar to tube ends, when ferruled up. Another method is to fit a flange on to the pipe with a portion of it made large enough to enter the tube plate hole, in this