. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ing statement. As shown by therecords, the Dragon was nol one offour built expressly for the company;was not the lirst on which that maker in-troduced the rocking grate; its main rodwas 110/ bent to clear the second crankpin and stub end; and the valves were notworked by two eccentrics each and alink, but by three eccentrics on each sideand rfro/i hook valve gear. The decided advantage of a direct con-nected eight driving wheel locomotive, as demonstrated in practical service by theperformanc
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ing statement. As shown by therecords, the Dragon was nol one offour built expressly for the company;was not the lirst on which that maker in-troduced the rocking grate; its main rodwas 110/ bent to clear the second crankpin and stub end; and the valves were notworked by two eccentrics each and alink, but by three eccentrics on each sideand rfro/i hook valve gear. The decided advantage of a direct con-nected eight driving wheel locomotive, as demonstrated in practical service by theperformance of the Dragon, was tooplain to be overlooked by any one of thenieclianical skill and ability of ThatcherPerkins, who was, at that time, Masterof Machinery of the Baltimore & OhioRailroad, and a locomotive of this type,the Hero. No. 54, was designed andIniilt by him, and put in service on theroad in May, 1848. The design of thisengine differed, however, from that of theDragon in the following particulars. TheBaldwin flexible beam truck was not ap-plied ; the driving were set as closely. together as the diameter of the drivingwheels permitted, reducing the wheel baseto 11 feet 3 inches; the wheels of thesecond and third axles had blind tires; theboiler was of larger diameter, and its fire-box was set behind the rear axle, and in-dependent cut-off valves were not used. No particulars of this engine have beenfound of record, other than that the cyl-inders were 17 x 22 inches and the driv-ing wheels 43 inches. Fig. 2, which isreproduced from an illustration in theBaltimore and Ohio Magazine, indicatesthe general design of Engine No. 54, andis the only representation of it which thewriter has been able to develop. The Perkins design, being apparentlyfound to be satisfactory by the Baltimore& Ohio management, that company issuedan advertisement, dated September 18,, for proposals for building four loco-motive engines in conformity with an ac-companying specification in 2
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