Not very far behind poetry and friendship as objects of existence came steam-engines, my fellow-engineer sitting next me, bottom but one of the form. We got illustrated catalogues from the makers of models, and copied and recopied diagrams of slide-valves, waste pipes, and eccentrics with a zeal and accuracy which, if devoted to lessons, must speedily have pulled us out of the humble positions we so contentedly occupied. A certain geographical jealousy was mixed up in this, since, though we both condemned the engines on the South-Western, on which line was Mortlake, as very poor and flimsy mechanisms, he, whose home was reached by the Great Northern, considered the engines on that line far superior to anything that the Great Western, which took me to and from Truro, had to show. He drew pictures of the Great Northern express engines, and I retorted with sketches of the “Flying Dutchman” (11.45 a.m. from Paddington), which went to Swindon without a stop and ran on a broad gauge, while the Great Northern was only a narrow gauge. Against that he set the fact that Peterborough was a mile further from London than was Swindon.... He was the happy possessor of a model locomotive with slide-valve cylinders and a waste-pipe going up the chimney, and though I could not run to that, by dint of saving up and of my mother’s anticipation of my birthday, I became possessor of another model with a copper boiler and a brass chassis called the “Dart.” The “Dart” had only oscillating cylinders, which, as all the world knows, do not discharge their waste steam up the funnel, but from small holes at their base, and have this further infirmity, that they only have one steam-driven stroke in each revolution of their fly-wheel, whereas a slide-valve cylinder has two. The slide-valve engine, therefore, was of a different class altogether from the “Dart,” but I found that I could get up a very powerful head of steam in the “Dart” by stuffing small pellets of blotting-paper up the safety-valve, so that she held her breath while her rival was letting off steam. Then, when for fear of a burst boiler I said the “Dart” was ready, and turned on the tap that conveyed the steam to the cylinder, she would start off like mad, and for a few yards easily outrun her more powerful rival. But long before she got to the end of the open-air cloisters where these races took place she would be overhauled; and, indeed, the “Dart” usually failed to run a complete course, and had to be bottled up again to develop fresh energy. But inferior as the “Dart” was in staying power, it must be accounted unto her for righteousness that she never burst when her safety-valve was stopped up. There was also a stationary engine (oscillating cylinder) belonging to one of us, but we unfortunately burned its bottom out by neglecting to put any water in the boiler.