Ellsworth M. Longfield

“ If the proper machine is available, an end may be "pressed on" the metal slat. Another method is to provide laps as shown by the dotted fines on the pattern. These laps may be fastened by one rivet. Holes for riveting the slats to the barrel must be laid out to correspond exactly to the spacing of holes in the body pattern, Fig. 159.
Assembling the Barrel.—The body blanks are cut from sheets of No. 24 galvanized steel 24 in. wide by 120 in. long. Rivet hole centers are transferred from the master pattern, and holes are punched in each blank. ”

“ The intersections from each point in the profile are traced to the miter line, and thence to the corresponding line of the stretchout. These intersections are connected by straight lines to obtain the miter cut. If the wooden core is to be used, some means for closing the end must be provided to prevent the core from slipping out. ”

“ Over-all dimensions Allowance for lock Locating rivet holes for slats Locating rivet holes for upper hoop Locating rivet holes for lower hoop Pattern for upper hoop and lower hoop: Length of blank required Method of joining ends Spacing rivet holes Pattern for bottom: Allowance for flanging Pattern for slat: Miter cut Size and location of rivet holes Size of wooden core Order in which parts are assembled Dimensions of Barrel.—The dimensions of the barrel would vary according to whether the job was standard, or special size. Different manufacturers have established their own standards. ”