Item 74828 - Pint-ype insulator, ca. 1916 Item 74828 - Pint-ype insulator, ca. 1916 Contributed by Maine Historical Society Item 74828 Zoom 4117px x 4200px - 13.7"w x 14.0"h @ 300dpi | Need a larger size? *Credit line must read: Collections of Maine Historical Society Image Info Pin-type insulators similar to this Lapp #6183 are still used on utility poles today. Insulators are necessary on electric lines to prevent current from "leaking" off the line. Show Details
