Scientific American, | DECEMBER 16, 1871. 386 Unequal expansion is, without doubt, one of the causes of Improved Steam Boiler. The accompanying engravings illustrate a boiler invented by F. A. Woodson, and patented in the United States and England, and for which applications for patents are now… … WOODSON’S STEAM BOILER. no ebullition, in the it immediately com- mences to pass back from the furnace over the surface of the tubes, delivering its steam quietly along the route, The passage of the water, through the pipe or “circulator,” itis heated to the boiling point. is more or less rapid,…
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