Scientific American, June 22, 1867.] 393 STEAM BOILERSTHEIR FORM, OONSTRUCTION, AND! the boiler becomes in some parts hotter than when it contains DAVIDSON'S SELF ADJUSTABLE HANGER. water, and rivets are sprung by the expansion. Sometimes MATERIAL, … specimen is sufficient without explanation to enable any is one of the worst. one to understand what it represents. Another instance of i He says: “I send yous a corrosion is an injury the ef fects of which cannot be re. medied by repairs. Nos, 1 and 2 with the cor: responding sections show the…
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