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#800 - JEFFREY MINE INSULATOR - Aqua. 
- Sold Winning Bid: $550.00
- 18 Bid(s) View Bid History
- Lot # 800
- System ID # 313464
- End Date
- Start Date
#800 CD 185 SPECIAL MINE INSULATOR. JEFFREY MFG. CO. COLUMBUS OHIO. PATENT SEPT. 25 1894. Aqua.
Drip points on top of insulator when the embossing is in an upright position.
David Osyor, assignor to Joseph Jeffrey (both of Columbus, Ohio) received a patent on the above name date 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.
The Jeffrey Manufacturing Company was formed in 1887, and became a very large supplier of mining and other equipment. The insulator was produced by the Hemingray Glass Company.
The lower portion of the insulator has an especially attractive, crude, pebbly surface!
Shallow chip, up from base on the reverse, is only half the size of a pinkie nail. The majority of the drip points are undamaged, or have only partial flaking - most appearing fully intact from the outside. One of the better embossed Jeffrey examples in regards to condition!