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year, and the next year is going to see even more development in this line. Owing to better workmanship^ better designing and building than formerly, the prejudice which largely existed among old engineers against this type of engine is rapidly wearing away. With the single cylinder engine under variable load, we often obtain poor economy, but, as compared with the Corliss, under similar conditions, allowing for the discrepancy in price, the result is not so disparaging. 'Now they are going further, and building compound and even triple expansion engines of this class. In the Brooklyn station we have the Ball, one of the representative types of this class of engines, being horizontal, compound engines.
These engines are built for high economy and economical work, and the guarantees made on them I think compare favorably with the guarantee on compound Corliss engines; at least, three or four of the manufacturers of this class of engine stand ready to-day to guarantee
