. American engineer and railroad journal . THE WILSON BOILER, Patent, 1805. Fig. 22.—THE PAXMAN BOILER, 1870. Burgh on BoiU rs, p M Wilson dropped a series of U tubes from the crown-sheet ofa vertical fire-box boiler (fig. 21) one end of the U passingthrough and considerably above the line of the crown-sheet. Paxman cut off the locomotive fire-box from Churchs design

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