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A locomotive ot a new description has been lately patented by Messrs. Remsen amp; Hutton of Troy, N. Y., a working model of which is now on exhibition at No. 6 Wall street. An account of this invention was given some time back, in the Scientific American, as will be seen by referring to page 260, Vol. 7, under the head of New Inventions. The theory propounded by the patentees is, iat the steam is more effectually employed in moving the crank during what is oiten termed the upper part of its revolution, than when it assumes the position beliw the horizontal. Or, in other words, they employ the power transmitted from the piston to pull the crank, but not to push it, so that the movement of each piston is effectual only when travelling in the same direction as the train. To attain this end, the patentees employ the single action principle, admiiting the steam to only one end of the piston. Of course either can be used, as it is necessary at times to reverse the engine, but, as a rule, the steam is admitted only above the piston, which they consider to realize a greater percentage of the power. Three cylinders are employed, one for each driving-wheel, and a third, which is situated between the other two acts on the axle, an arrangement that is, in reality, equivalent to a three-throw crank, the nature of which is well understood by all locomotive engineers.
