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#3808 CD 185 MINE INSULATOR. Aqua. 
- Sold Winning Bid: $300.00
- 14 Bid(s) View Bid History
- Lot # 3808
- System ID # 803212
- End Date
- Start Date
#3808 CD 185 MINE INSULATOR. Aqua.
Various manufacturers produced this type of insulator, originally designed to be used in mines.
David Osyor, assignor to Joseph Jeffrey (both of Columbus, Ohio) received a patent on September 25, 1894 for improvements in conductor supports and insulators. The invention consisted of a metal pin, formed in two halves, that was hollow on the interior. A duct, or opening, was formed in the pin at the top of the threaded portion. When the insulator was screwed in place, this hole in the pin was positioned at the top of the interior glass cavity.
These insulators were designed to be used in mines, where constant dripping of water from the ceilings occurred. This invention allowed for water to escape the interior cavity of the insulator, as the water would drain through the duct, into the hollow interior of the metal pin, and out through the bottom center of the insulator.
One of few insulators that actually have the word "Insulator" embossed on them.
Pencil eraser diameter flake, up from base at side mold line. Shallow flakes on the collar just below the pinhole. The outer area is in pretty nice condition for a CD 185, as they often encountered damage due to extreme conditions during usage.