. Bulletin - United States National Museum. Science. Figure 23. - Cyundi r head with valve b\ removed. Figure 24.âBottom ol valve box with sli<l<- valve 25 and 26.âCylindir with valve box removed, >tnâ \\i 11 â _; val type frame than any other (I'm-. 18,27). While the simple bar frame enjoyed the greatest popularity in the last century, riveted frames were widely used in this country, particularly by the .New England builders between about WHO and WitiO. The riveted frame was fabricated from two plates of iron, about %-inch thick, cut to the shape of the top rail and the ped
. Bulletin - United States National Museum. Science. Figure 23. - Cyundi r head with valve b\ removed. Figure 24.âBottom ol valve box with sli<l<- valve 25 and 26.âCylindir with valve box removed, >tnâ \\i 11 â _; val type frame than any other (I'm-. 18,27). While the simple bar frame enjoyed the greatest popularity in the last century, riveted frames were widely used in this country, particularly by the .New England builders between about WHO and WitiO. The riveted frame was fabricated from two plates of iron, about %-inch thick, cut to the shape of the top rail and the pedestal. A bar about 2 inches square was riveted between the two plates. A careful study of photo- graphs of Hinkley and other New England-built engines of the period will reveal this style of construc- tion. The frame )' the Pioneer differs from the usual riveted frame in that the top rail is 1 s4 inches thick by IV inches deep and runs the length of the locomotive. The pedestals are made of two 3s-inch plates flush- riveted to each side of the top rail. The cast-iron shoes which serve as guides for the journal boxes also act as spacers between the pedestal plates. The bottom rail of the frame is a l's-incli diameter rod which is forged square at the pedestals and forms the pedestal cap. The frame is further stiffened by two diagonal rods running frorn the tup of each truck- wheel pedestal to the base of the driving-wheel pedestal, forming a truss. Six rods, riveted to the boiler shell and bolted to the frame's top rail, strengthen the frame laterally. Four of these rod-. an be seen easily as they run from the frame to the middle of the boiler; the other two are riveted to the underside of the boiler. The attachment of these rods to the boiler was an undesirable practice, for the boiler shell PAPER 42: THE "PIONEER" OF 1851 263. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration an
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
