. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. SIDE ELK\AI1UN Fig. ii8. -The Air Compressing Plant at the Cwmystwith 178 MACHINERY FOR METALLIFEROUS MINES. being such that the motion, while abrupt, is one of gradual accelerationa?id retardation^ similar to that of a piston. Both the cam rollers are always in contact with the cam, consequentlylost motion is impossible, and as the total movement of the rod is effectedin a small arc of the wrist plate motion, at a time when the wrist plate ismoving at its greatest velo
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. SIDE ELK\AI1UN Fig. ii8. -The Air Compressing Plant at the Cwmystwith 178 MACHINERY FOR METALLIFEROUS MINES. being such that the motion, while abrupt, is one of gradual accelerationa?id retardation^ similar to that of a piston. Both the cam rollers are always in contact with the cam, consequentlylost motion is impossible, and as the total movement of the rod is effectedin a small arc of the wrist plate motion, at a time when the wrist plate ismoving at its greatest velocity, while the air piston is nearly at a state ofrest, it is patent that the valves are closed at the most favourable moment,without restricting the natural flow of air in the least. Each inlet valve being closed at the same time as the opposite outletvalve, the theoretical velocity of valve movement at the point of closurebeing zero, there is no wear nor shock on the valve faces and seats. These are accordingly made extremely narrow, and, while alwaysremaining tight, are almost indestructible. No springs nor loose pieces are employed whatever in this gear, con-
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
