Hartford Steam Boiler Inspection and Insurance Company · Hartford, Ct. : Hartford Steam Boiler Inspection and Insurance Co · leaf 85
ly, and making a straight fit instraight tube sheet holes. It is a sectional tool, its parts being held together bya spring ring b. When assembled, these form a body with a tapered bore. A tapermandrel is provided, which, when driven in, distends the sections, increasing thediameter of the tool.… … Fig. 3. — The Prosser Expander. The Dudgeon roller expander, Fig. 4, was the next to appear, and is stillvery extensively used. This tool, as its name implies, enlarges the tube by arolling process. Three steel rollers are held in seats in a body, and are revolvedand forced outward by a slightly…
Locomotives · Steam-boiler explosions
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten02unit-748-321.webp)
