Item 74824 - Electrical insulator pin, ca. 1917 Item 74824 - Electrical insulator pin, ca. 1917 Contributed by Maine Historical Society Item 74824 Zoom 4200px x 1500px - 14.0"w x 5.0"h @ 300dpi | Need a larger size? *Credit line must read: Collections of Maine Historical Society Image Info The pin is part of a type of electrical insulator -- a device that keeps electrical current from "leaking" out of lines. The insulator with the pin (that screws into the base of the porcelain insulator) was patented in 1865. Show Details
