This is a display cabinet of my glass pintype power insulators. These insulators were used for high voltage distribution and are the largest and heaviest glass pintype insulators produced in North America. Take insulator CD 331 which is 15" wide and 11" high and weighs in at 38 lbs, which makes it the largest and heaviest glass pintype insulator produced in North America. This Pyrex insulator was produced by the Corning Glass Works in Corning, New York in the 1930's and supported voltages of 70,000 volts. One of the more unique insulators which is really not a power insulator is the CD 317 Chambers Lightning Rod Insulator. This insulator was produced by the Hemingray Glass Company in Covington, Kentucky from c1877-1880's which were used on lightning rod systems.