. American engineer . reduction in piecework prices possible. The heater calledattention to the ease with which any desired regulation couldbe obtained. It is well known that under ordinary working con-ditions the back of the furnace is much hotter than the necessitates great care iu the heating of large objects thatextend all the way across the furnace, lest the part next theback wall be burned. With the gas furnace this danger is easilyobviated by merely turning off a part of the gas from the backburner. In like manner any desired degree of regulation can beobtained at the center
. American engineer . reduction in piecework prices possible. The heater calledattention to the ease with which any desired regulation couldbe obtained. It is well known that under ordinary working con-ditions the back of the furnace is much hotter than the necessitates great care iu the heating of large objects thatextend all the way across the furnace, lest the part next theback wall be burned. With the gas furnace this danger is easilyobviated by merely turning off a part of the gas from the backburner. In like manner any desired degree of regulation can beobtained at the center and front, so that no matter what the sizeor shape of the piece it can be evenly and uniformly heatedthrougliout and be in an ideal condition for the hammer when itis taken out. This evenness of heating is very desirable in the tool is the intention, however, to remove the tool furnaces fromthe realm of guesswork as to temperatures and equip the onethat will be used for the major portion of the work with a. Blowers in Gas House. pyrometer. This step is in accordance with the suggestionsmade at the New York Railroad Club at the November meetmg,though the action was taken before the suggestions were is expected that the heating and cooling of the tool steel inaccordance with pyrometric indications will make it possible toentirely avoid all cracks in tnols because of faulty Iiardcning andtempering. The use of gas in the foundry core ovens is also satisfactory and results in somewliat more rapid drying tlian where coal wasused. For example the time required to dry a cylinder corewith coal was usually about 14 hours. With gas the work isalways done in 12 hours and has been done in 6 hours. Theaverage time required for the general run of cores was 6 hoursfor coal, while it is about 4>4 hours with gas, and that too with-out parching or drying so hastily as to cause the cores to crumble.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
