THE "Russell" Four Valve Engine, originally intended to occupy the field of large units only, has by its excellent performance in steam economy, forced intself into the field intended solely for our single valve engine, to the extent that we now build the "Four Valve" in all sizes from eighteen inch stroke up. The Illustration on the proceeding pages show a front and rear view of the simple engine, and conveys a good idea of its general appearance. We have aimed to make it as plain and rigid as possible. At the same time, we have endeavored to impart to it that grace of outline that comes from a proper distribution of material, dictated as well by experience as by theoretical training. Here are shown the outward evidences of handling the valves, in which particular the "Russell" Four Valve Engine is decidedly different from any other engine. The admission, cut off, release and compression are each taken care of by separate devices, and these will be treated in detail as we come to them later on. Suffice it here to say that our valve arrangement makes it possible to adjust any one of the four points mentioned independently of the others, and the practical engineer readily appreciates the convenience of this, as it enables him to so adjust his engine as to obtain not only smooth running but exceptional economy as well as close regulation even when the load is of the most varying kind.
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