. The railroad and engineering journal . Fig. 41 In 1862, the method shown in Fig. 51 was adopted. In thisthe copper end was dispensed with, and a copper thimble wasplaced on the end, outside of the tube, as shown. The Prosser expander was first used at the Rogers Worksin 1S63. This is shown by Figs. 52 and 53. Fig. 52 is aside view with the end of the tube and plate shown iu sectioaat ^ and .■/. The expander consists of what may be called aplug composed of eight sector-shaped pieces, as shown in theend view, Fig. 53. These are held together by an open steel-spring ring B. In the center of the

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. The railroad and engineering journal . Fig. 41 In 1862, the method shown in Fig. 51 was adopted. In thisthe copper end was dispensed with, and a copper thimble wasplaced on the end, outside of the tube, as shown. The Prosser expander was first used at the Rogers Worksin 1S63. This is shown by Figs. 52 and 53. Fig. 52 is aside view with the end of the tube and plate shown iu sectioaat ^ and .■/. The expander consists of what may be called aplug composed of eight sector-shaped pieces, as shown in theend view, Fig. 53. These are held together by an open steel-spring ring B. In the center of the sector. there is a taperedhole C, Fig. 53 (shown by dotted lines in Fig. 52), intowhich a tapered plug, Fig. 54, is driven. The open spring-ring permits the sectors to separate when the tapered plug iEdriven into the opening. The sectors each have a shoulder

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887