Item 8919 - Rolling shell, vertical boiler, Portland Company, ca. 1920 Item 8919 - Rolling shell, vertical boiler, Portland Company, ca. 1920 Contributed by Maine Historical Society Item 8919 Zoom 4460px x 2520px - 14.9"w x 8.4"h @ 300dpi | Need a larger size? *Credit line must read: Collections of Maine Historical Society Image Info Rolling shell with a 120-inch diameter for a vertical boiler shown in the Portland Company workshops, ca. 1920. Show Details