. Railway mechanical engineer . Fig. 2—Portable Scaffold for Boiler Work Fig. 4—Holder-On for Riveting the Boiler Barrel to the Wrapper Sheet holes being provided in one leg of the vertical angles forsecuring it to the frame work. At the top there is a railbetween the two uprights, which prevents the men from fall-ing when the platform is raised to the top of the scaffold.Fig. .3 shows the method used for backing up the rivet 249 250 RAILWAY MECHANICAL ENGINEER Vol. 90, No. 5 hammers when riveting the boiler barrel to the firebox, thehelper, of course, being inside the barrel instead of on the
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