[CHAPTER VII.]
GEORGE STEPHENSON'S FARTHER IMPROVEMENTS IN THE LOCOMOTIVE—THE HETTON RAILWAY—ROBERT STEPHENSON AS VIEWER'S APPRENTICE AND STUDENT.
Stephenson's experiments on fire-damp, and his labors in connection with the invention of the safety-lamp, occupied but a small portion of his time, which was necessarily devoted, for the most part, to the ordinary business of the colliery. From the day of his appointment as engine-wright, one of the subjects which particularly occupied his attention was the best practical method of winning and raising the coal. Nicholas Wood has said of him that he was one of the first to introduce steam machinery underground with that object. Indeed, the Killingworth mines came to be regarded as the models of the district; and when Mr. Robert Bald, the celebrated Scotch mining engineer, was requested by Dr. (afterward Sir David) Brewster to prepare the article "Mine" for the "Edinburg Encyclopædia," he proceeded to Killingworth principally for the purpose of examining Stephenson's underground machinery. Mr. Bald has favored us with an account of his visit made with that object in 1818, and he states that he was much struck with the novelty, as well as the remarkable efficiency of Stephenson's arrangements, especially in regard to what is called the underdip working.
"I found," he says, "that a mine had been commenced near the main pit-bottom, and carried forward down the dip or slope of the coal, the rate of dip being about one in twelve; and the coals were drawn from the dip to the pit-bottom by the steam machinery in a very rapid manner. The water which oozed from the upper winning was disposed of at the pit-bottom in a barrel or trunk, and was drawn up by the power of the engine which worked the other machinery. The dip at the time of my visit was nearly a mile in length, but has since been greatly extended. As I was considerably tired by my wanderings in the galleries, when I arrived at the forehead of the dip, Mr. Stephenson said to me, 'You may very speedily be carried up to the rise by laying yourself flat upon the coal-baskets,' which were laden and ready to be taken up the incline. This I at once did, and was straightway wafted on the wings of fire to the bottom of the pit, from whence I was borne swiftly up to the light by the steam machinery on the pit-head."
The whole of the working arrangements seemed to Mr. Bald to be conducted in the most skillful and efficient manner, reflecting the highest credit on the colliery engineer.
Besides attending to the underground arrangements, the improved transit of the coals above ground from the pit-head to the shipping-place demanded an increasing share of Stephenson's attention. Every day's experience convinced him that the locomotive constructed by him after his patent of the year 1815 was far from perfect, though he continued to entertain confident hopes of its complete eventual success. He even went so far as to say that the locomotive would yet supersede every other traction-power for drawing heavy loads. It is true, many persons continued to regard his traveling engine as little better than a dangerous curiosity; and some, shaking their heads, predicted for it "a terrible blow-up some day." Nevertheless, it was daily performing its work with regularity, dragging the coal-wagons between the colliery and the staiths, and saving the labor of many men and horses.
There was not, however, so marked a saving in the expense of haulage as to induce the colliery masters to adopt locomotive power generally as a substitute for horses. How it could be improved, and rendered more efficient as well as economical, was constantly present to Stephenson's mind. He was fully conscious of the imperfections both in the road and the engine, and gave himself no rest until he had brought the efficiency of both up to a higher point. Thus he worked his way inch by inch, slowly but surely, and every step gained was made good as a basis for farther improvements.
At an early period of his labors, or about the time when he had completed his second locomotive, he began to direct his particular attention to the state of the Road, perceiving that the extended use of the locomotive must necessarily depend in a great measure upon the perfection, solidity, continuity, and smoothness of the way along which the engine traveled. Even at that early period he was in the habit of regarding the road and the locomotive as one machine, speaking of the Rail and the Wheel as "Man and Wife."
All railways were at that time laid in a careless and loose manner, and great inequalities of level were allowed to occur without much attention being paid to repairs. The consequence was a great loss of power, as well as much wear and tear of the machinery, by the frequent jolts and blows of the wheels against the rails. Stephenson's first object, therefore, was to remove the inequalities produced by the imperfect junction between rail and rail.