. American engineer and railroad journal . e, until enough have been turned on toheat the tube red a couple of inches toward the rear end fromwhere the boat lays inside. Continue the combustion after thelast burner is lighted, about 15 minutes for steel and not lessthan 30 minutes for pig or cast iron, taking care to keep the 348 THE AMERICAN ENGINEER [July. 1893. flow of oxygen to tlie combustion tube suflipient to mainlain asliirlit pressure in this tulie, and at tlie same time not allowover about three Imlililes (ler second to pass the absorptionpotiish bulb. After the burning is completed,
. American engineer and railroad journal . e, until enough have been turned on toheat the tube red a couple of inches toward the rear end fromwhere the boat lays inside. Continue the combustion after thelast burner is lighted, about 15 minutes for steel and not lessthan 30 minutes for pig or cast iron, taking care to keep the 348 THE AMERICAN ENGINEER [July. 1893. flow of oxygen to tlie combustion tube suflipient to mainlain asliirlit pressure in this tulie, and at tlie same time not allowover about three Imlililes (ler second to pass the absorptionpotiish bulb. After the burning is completed, turn down thegas supply to the burners by means of a coek one half, orturn out every other burner so as to allow the condiusliontube to cool down slowly, and then shut olf the oxygen supplyand turn on the air supply for aspiration. Allow not less thana liter of air to pass througli the absorption potash b\ill), at arate of not over three Iiuhliles a scond. While the as|iirationis going on, diminish the gas su]iply to the burners by means. x«(\e Fig. I. of the eoeU. <ir turn out additional ones as fast as the lulie willstand it. When the aspiration is eomplele, the potashbulb and prolong from the furnace, close the ends with rubbercaps, and jdace in the balance case. Allow to stand min-utes, and then ■weigh. .\Ir.\Ii.\TlS .\Nn We prefer to \ise, in dissolving the iron or steel, a jar ofthick, heavy glass, rather than a beaker. The j:irs we havefound \ hold about ;\ pint, anil have a nose for is shown in fig. 1. about 40 in. long. The two horizontal parts at the top of llieframe are perforateil with j-in. holes.) in. apart each way, whichholes, without any l)usliing, serve as bearings for the hollowluludar shafts. The top of each shaft carries a wooden pulley■I in. in diamiler, which has a brass laishing and set screw b\-means of which it is fastened to the shaft. Itrass washers be-tween the ]udleys and the top of the frame car
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
