. American engineer and railroad journal . ry of the conclusions of these tests appeared on page127 of the June issue. t See American Engineer, June, 1906. page 228. position of this edge for locomotive No. 5266 is as shown, 21^/iinches above the bottom of the smoke-box. The plate was low-ered sYi inches from this normal position, and after a short trialrun it was raised S^ inches above the normal position and atrial made. These changes in the position of the diaphragm plate producedno marked effect upon the burning of the fire. It burned evenlyover the whole grate under each adjustment of the
. American engineer and railroad journal . ry of the conclusions of these tests appeared on page127 of the June issue. t See American Engineer, June, 1906. page 228. position of this edge for locomotive No. 5266 is as shown, 21^/iinches above the bottom of the smoke-box. The plate was low-ered sYi inches from this normal position, and after a short trialrun it was raised S^ inches above the normal position and atrial made. These changes in the position of the diaphragm plate producedno marked effect upon the burning of the fire. It burned evenlyover the whole grate under each adjustment of the diaphragm,and the locomotive appeared to steam as freely with the plate ineither the upper or the lower positions as it did under normalconditions. The fact that the diaphragm is perforated may account for thelack of sensitiveness or marked effect upon the fire when theplate is given a new position. PRELIMINARY TESTS. The trials of front ends made by the Master Mechanics Com-mittee did not determine the arrangement of the diaphragm plate. to make the smoke-box self-cleaning, and the first considerationin these tests was to investigate the shape of the diaphragm andits location in the smoke-box for this purpose. A diaphragm of the general type recommended by the Commit-tee as applied to this locomotive is shown on drawing Fig. 2. Thewhole diaphragm plate was without perforations, and, as firstapplied, extended beyond the center line of the nozzle a distanceof i6J4 inches. At its end there was an angle and a plate 4J4inches wide extending downward to a point 13J4 inches abovethe bottom of the smoke-box. The netting was omitted for thesepreliminary trials. With the arrangement as described above a test was made (), using a friable coal and working the boiler at about thelimit of its capacity to maintain a good pressure. The arrange-ment was found to be perfectly self-cleaning, there being nocinders at all left in the bottom of the smoke-box. An inside stack according to
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
