Fig. 3 shows a machine with a fifty-two-inch rear driver, _R_, and an eighteen-inch front steering wheel, _F_, with the saddle twenty degrees in front of the vertical line through the driving axle. The curves are just the reverse of the Ordinary; in the latter the quick drop, down and back, of the rear wheel in leaving is comparable to the backward thrust of the front wheel in Fig. 3 running upon the obstruction. No machine in the market at present makes exactly the curve of Fig. 3; it is about that which the American Star would make with its saddle a little farther forward, and that of a recent rear-driving crank machine called the “Eagle.” Fig. 4 shows the American Star, as commonly seen, with a fifty-two-inch rear driver and the saddle directly over the driving axle. This curve shows no elevation of the saddle as the front wheel mounts the obstacle, but a radical check to the momentum is shown; observe the curve (_F_), and note that the saddle is forced back in the order of the small numerals, advancing to 1, going back to 2, then on to 3 and 4, which shows that the momentum is not deviated up or down, but is directly reversed in its course. Fig. 5 shows a new machine of the Star pattern, with twenty-four-inch front steerer, _F_, and a thirty-nine-inch rear driver, _R_. The check in the momentum is not so radical as that shown in Fig. 4, as the front wheel mounts the obstacle. The one short line below the curve shows the backward thrust. The sudden check in striking an obstacle, with the machines last referred to, shows the necessity and enormous advantage of a forward give to the saddle support adopted in some of those patterns. This arrangement is not so necessary in the Ordinary, yet it would do no harm, for it will be seen that the large front wheel of the latter strikes the obstacle with quite a sudden upward curve and check in the momentum sufficient to justify its use.