. American engineer and railroad journal . the boiler, therefore more SS6 AMERICAN ENGINEER, CAR BUILDER liable to damage and renewals. This has proved itselfin the case of copper tubes, which, although a betterconductor of heat than either iron or steel, yet were unableto stand the severe work they had to perform. The danger fromoverheating and rupture is not only very unpleasant from a steke-hole point of view, but the giving way at some critical moment de-mands our most important consideration; in is the vitalpart of the water-tube boiler. Seeing this diflBcuIty some time ago, the
. American engineer and railroad journal . the boiler, therefore more SS6 AMERICAN ENGINEER, CAR BUILDER liable to damage and renewals. This has proved itselfin the case of copper tubes, which, although a betterconductor of heat than either iron or steel, yet were unableto stand the severe work they had to perform. The danger fromoverheating and rupture is not only very unpleasant from a steke-hole point of view, but the giving way at some critical moment de-mands our most important consideration; in is the vitalpart of the water-tube boiler. Seeing this diflBcuIty some time ago, the writer devised somemeans by which the first row was relieved of this heavy duty, andmore laid on those immediately behind. This is accomplished bysubstituting tubes of much larger diamerer nearest to the fire thanthose which are more remote. The larger tubes contain morewater, and present less heating surface for the space occupied thanthose of smaller diameter. The result is that is less ccpn ^•^-^ o;ooo V, Jo 4 oo ^-^. ^V<oo o ooo. /o o o oo ^-^-^ 00 O|0 I D O oTo O ame. The diagram representing the of the trials is shown on Fig. 7, the top curve, as before,representing the results of the two boilers. Practically there isvery little differenceicompared with the similar top,curves of and 5; it auything, it is slightly in favor of Fig. 7. But when wecome to compare the two lower curves; with the similar curvesin Fig. 0, we find that they have almost changed places. Takingthe top or larger boiler, the evaporation at 10 degrees is nearly 60per cent, of the total, as compared with a little over 40 per cent;shown on the former trial, the; curve dropping down at 90 de
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
