. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . comotive. He was the Iirst toconstruct boilers that extended overthe frames of the locomotives, and wassuccessful in using anthracite in thefireboxes that he designed. Some of the boilers constructed byMillholland were equipped with com-bustion chambers, but these werequickly discarded by him, and he ad-hered to the form of boiler almostsimilar to what is now known as theWoottcn boiler. While experimentingon boiler construction he was also busyon wheel arrangements and producedthe first of wh
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . comotive. He was the Iirst toconstruct boilers that extended overthe frames of the locomotives, and wassuccessful in using anthracite in thefireboxes that he designed. Some of the boilers constructed byMillholland were equipped with com-bustion chambers, but these werequickly discarded by him, and he ad-hered to the form of boiler almostsimilar to what is now known as theWoottcn boiler. While experimentingon boiler construction he was also busyon wheel arrangements and producedthe first of what is known as theMogul type of locomotive. Out of hisnumerous variations in constructionalso came the balanced throttle valvebeing the first double seated throttlevalve applied to a locomotive. Thebreaking of cranked axles being of fre-quent occurrence among the early loco-motives owing to the poor forgingfacilities, Mr. Millholland conceivedthe idea of adopting cast iron axles,:.iul in view of the fact that the steampressure used on locomotives was com-I>aratively low at that period, the cast. BAKER-riLLIOD V,M.\K GKAR AS APILIICU TO C. & in 1830, a bright lad of eighteen yearsnamed James Millholland was workingon the job. The Tom Thumb as thelocomotive was named was lookedupon by mechanics generally as an idleand dangerous experiment. Millhol-land thought differently and gave hisearnest attention to the constructionof locomotives. At twenty-one he wasMaster Mechanic of the Baltimore &Susquehanna Railroad, and he soonfound opportunities for extensive ex- iron axles met the requirements of theservice better than the poorly forgedaxles. One of Mr Millhollands clever in-ventions was a movable cone whichwas adapted to increase or diminishthe amount of space in the opening ofthe exhaust nozzle. A system of rodsand levers furnished means of adjust-ing the contrivance from the enginecab. It is a noteworthy fact that thisdevice has been patented several times i-ince
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