. Railway age . second gage,and the throttle, and this may bi cut down as low as 11 In. withmore water and the engine on a grade: while, with the surgingot ttie water, when the engine is in motion the wave crest maycome very close to the throttle Itself. Attention is called to thesepoints merely to show how allowances that were formerly consid-ered the minimum have been cut down until they have practicallydisappeared under the stress ot the later designs. Compare thisclearance with that obtained with the old boilers with a high domeon the wagon top and the difference will be seen to be very ma
. Railway age . second gage,and the throttle, and this may bi cut down as low as 11 In. withmore water and the engine on a grade: while, with the surgingot ttie water, when the engine is in motion the wave crest maycome very close to the throttle Itself. Attention is called to thesepoints merely to show how allowances that were formerly consid-ered the minimum have been cut down until they have practicallydisappeared under the stress ot the later designs. Compare thisclearance with that obtained with the old boilers with a high domeon the wagon top and the difference will be seen to be very the same way there is a tendency on recent designs to placethe Injector check well up to the front tubesheet. In this case thereIs but 8Vi In. from the center to that sheet, and this in spite of theprotests that hnvi been made that such close proximity tends toleaky tubes. Kvldrntly that claim Is not being Part of the engines built on this order have been fitted with THE RAILROAD 469 steel tubes and the balance with charcoal iron. At the firebox endthe slope of the side-sheets is such that there is a chance for afree liberation of the steam over the entire surface with a directrise away from the metal throughout the whole distance from thefoundation ring to the crownsheet. The spread of the sheets is7o% in. at the bottom, drawing In to 62 in. at the springing pointof the curve of the crownsheet. This gives an inward slope of1 In 7 to the sheet. Again it may be well to contrast the condi-tions for steam liberation thus obtained with those of the narrowfirebox set between the frames, where the waist of the firebox wasdrawn in as with corsets, and the steam trailed over the sidesheets the whole distance from the point of its generation to thespace provided for it over the crownsheet. With the wide firebox,the quality of the steam as it enters the steam space must bemuch dryer than was possible with the old firebox, and thus thenecessity for the gr
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Keywords: ., bookcentury1800, bookdecade1870, bookidrailwayage44, bookyear1870
