than that which is required to de- thickness of the central head combined. velope a new mechanical movement, or ori- The valve, a, is enlarged above the pivot, ginate a new plan-mode or mechanical prin- ‘| b, soas to engage with the bosses on the ciple. The faculty of inventing depends pistons, D… … move the valve, by means of the handle, e, simply because they do not possess that ima- IT STEAM ENGINE. & MASON’S 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 existence, and…
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