As already stated, the Allen valve-gear required the position of the eccentric to coincide with that of the crank, so that these should pass their dead points simultaneously. To insure this and to make it impossible for the engineer to advance his eccentric, which he would be pretty sure to do if he could, I made the eccentric solid on the shaft. This also enabled me to make it smaller, the low side being brought down nearly to the surface of the shaft. The construction, moreover, was substantial and saved some work. All eccentrics that I had seen were flanged on each side to keep the strap in place. I observed the oil to work out freely between the flanges and the strap. This action would of course be increased in high-speed engines. So I reversed the design, as shown in the above sections of these two bearings at the top of the eccentric, putting the flanges on the strap instead of on the eccentric. It will be seen that the more rapid the speed the more difficult it becomes to keep the oil in the first bearing, and the more difficult it becomes for it to get out of the second one. I ought to have adopted the same construction for the main shaft journal, but in all the years I was making engines it never occurred to me. I contented myself with turning a groove in the hub of the crank, as shown to prevent the oil from getting on the disk. The problem of crank-pin lubrication at high speed at once presented itself and had to be met. I finally solved it in the manner partially shown on page 54. A wiper was bolted on the back of the crank, and from it a tube entered the diagonal hole in the pin. This always worked perfectly. This wiper and the oil cup are shown on page 230. Other devices have been employed by various makers of high-speed engines, but I always adhered to this one. It has the advantage of being equally applicable to double-crank engines. Aside from the above features, the design for my exhibition engine was made by Mr. Richards. CHAPTER V Invention of the Richards Indicator. My Purchase of the Patent. Plan my London Exhibition. Engine Design. Ship Engine Bed to London, and sail myself.