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own the valley of the Tyne, past Wylam, through Newcastle, and over the high bridge that our fireman's grandson, Robert, built in later days. Few valleys are less attractive, and few seem less likely to be the birthplace of epoch-making men. Robert Stephenson, the father of our hero, was a fireman, earning two shillings a day. He was sober and industrious, but as would be expected, he never "got on." He was a good story-teller, and transmitted to his children healthy bodies and clear heads. George was the second of six children, and he was born June 9, 1781, during our war for independence. His boyhood was uneventful enough. When the weather was cold he was cooped up in their narrow home; he was out of doors whenever the weather would permit. He played in the street, ran errands, carried his father's dinner, and herded cows, as soon as he was big enough, for four cents per day. At fourteen he was assistant-fireman, earning twenty-five cents a day, and at seventeen he was "plugman." He was thus in contact with much that had been achieved in the way of building engines and transporting materials on cars. But I must describe the engines then in use, and explain what it was to be a "plugman." The coal-mines were so deep that, in spite of the valleys, they could be drained only by pumps, and it was often more difficult to keep the water out than it was to lift the coal out. The steam-engine was then in a very incomplete condition, and both pumping-and lifting-engines were crude and clumsy affairs. To be sure Watt, the mathematical instrument-maker, had invented the double-acting steam-engine, but few had been manufactured, and those in common use were "atmospheric" engines, known as "Newcomen's" engines. A pumping-engine had a long, vertical cylinder, with arrangements for admitting steam at the top. The weight of the piston, piston-rod, and pump-rod, which ran down a shaft to the lowest point in the mine, being balanced by a counter-weight on a sort of well-sweep, the steam, admitted by hand, forced the piston to the bottom of the cylinder. The steam was then shut off, and a spray of water was turned on within the cylinder. This water condensed the steam and reduced the pressure within to almost nothing, so that the air pressure on the exterior face of the piston (which amounted to over a ton for every square foot of surface) drove the piston to the top of the cylinder, and lifted the full length of the stroke a large
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