Dimensions of Valve Motion. Length of expansion link between centres, Reversing Gear.-The reversing is performed by means of a screw arrangement, firmly supported on the right-hand side of foot-plate, as shown by the drawings. Coupling Rods.-These are of Bessemer steel of the form shown, with solid ends and syphons, and fitted with phosphor-bronze bushes. Each rod was forged solid in one length, and then finished bright. Coupling Rod Pins.-These are of wrought iron case-hardened, accur ately turned to gauge, and exact duplicates of each other. They were turned to a taper of 1 in 50 and forced into the wheels by hydraulic pressure, the inner end being afterwards riveted over; the outside end of pin is fitted with a screwed washer and taper pin. Bogie.-The bogie has four wheels of the form and dimensions shown on drawings. The frames are of steel, raised as shown over the axles, the inner sides being planed all over, and the outer sides where any attachment is made. The carrying girders are of the best Yorkshire angle iron bent round and securely riveted to the frames, and machined on the outer sides, clearances being made where required. Steel bearing plates planed and scraped to a good working surface were riveted to the angle irons. The ends of the frames were stayed by flanged plates of BB Staffordshire iron placed vertically, and bolted to the frames by the horn block bolts. When finished the frames were adjusted perfectly true and square. The sliding block bears on the steel plates and works between the angle irons, the side play being controlled by Timmis' unequal section steel springs. The bogie pin is of wrought iron, has a projection on it fitting into a corresponding hole in the horizontal plate under cylinders to which it was securely riveted, and the screwed end has a washer nut secured by a taper pin. The sliding block is of crucible cast steel, machined on all working and bearing parts, scraped to a good working surface on the sliding portions, and provided with fixed lubricators and oil grooves. The spring cradles were made of the best Yorkshire iron, with wroughtiron saddle pieces at each end, shaped to bear on the axle boxes, and fitted with oil syphons. The spring shaft is of the best Yorkshire iron passing through cast-iron bushes in the frames, with washer nuts and taper pins outside the spring buckles. Section of angle iron for carrying girders, 7 in. by 5 in. by 1 in. steel bearing plates, 6 in. by 3 in. by in. Length Depth stays, Total side play of bogie, Diameter of bogie pin, at bottom end, Section of iron for spring cradles, 5 in. by 1 in. Length Springs and Connections.-The springs are of the very best spring steel. Before being put in position each spring was fully tested until the camber was taken out, and the spring found afterwards to resume its original form. The bogie springs are inverted, the buckles being connected direct to the shaft through the bogie frames; the ends of springs are connected to the spring cradles by hooks. The driving springs are underhung, and the buckles are connected to the axle boxes by T-links as shown. The ends of the driving springs are connected to wrought-iron liners on the frames by adjustable links. The trailing springs are of Timmis' unequal section steel spring, two under each axle box, arranged in the manner shown on the drawings. All the brackets, links, hooks, buckles, and pins connected with the springs are of the best Yorkshire iron, and the working surfaces were thoroughly case-hardened. 호 Axle Boxes.-The axle boxes are of the best gun-metal, lined with white metal of the same quality as the connecting- Horn Blocks and Horn Stays.-The horn blocks are of crucible cast steel. The bogie horn blocks are fitted CRANK SHAFT AND ECCENTRICS FOR DUBS & Co.'s LOCOMOTIVE. Axles.-These are of crucible cast steel of Vickers, Sons, & Co.'s make. The webs of crank axle are hooped; all journals, Cross sections of crank arms, 12 in. by 4 in., and 12 in., by in. 7 9 71 73 1 1 Wheels.-These are of wrought iron, of the best materials and workmanship, with solid rims, spokes, bosses, and balance weights. The spokes were forged with solid T-ends and welded in the centre. The surfaces of rims and spokes were shaped so that the wheels exactly balanced. Each wheel was bored taper and put on the axle (before the tyres were shrunk on) by hydraulic pressure of 60 tons, and then properly keyed on. Great care was taken that the keys fitted accurately. |