. From the owners of these last the in- A Plea for Inventors. are placed upon a piston rod, E, the distance between them ventor receives no royalty, nor do the former in anywise Of all the mental efforts requiring imaginative construc- being a little more than the length of the stroke and the make… … move the valve, by means of the handle, e, simply because they do not possess that ima- Fig. l.-SMITH & MASON'S STEAM ENGINE. at the proper instant, when steam will be ginative construction necessary to give the admitted on what was before the exhaust side of the central new creation mental…
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