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CD 187 - Insulator of the Week on Wed, 30 Apr 2008


Brown's Pony; Duplex Insulator; Through Hole; "Mine Insulator"

Related Patents

Utility Patent 353120 issued to Robert G. Brown on November 23, 1886



California: Found in shades of sage green, smoke, purple and citrine/yellow. All are considered scarce. PicturePoster #129671567

Greeley N.Y. Patented Nov. 23rd 1886: Light aqua. Considered to be relatively rare. PicturePoster #38006430

No embossing: Light aqua. This listing contains a 5/8" pinhole and appears to be quite rare.

PicturePoster #98449546 (5/8" pinhole comparison)

Pat'd: Green. Lacks the patent date that is found on the following listing.

Pat'd Nov. 23d 1886: Clear & light purple (very scarce to rare). More commonly found in shades of aqua and green. Values begin to escalate as the green shades become deeper and pick up olive and amber tones. Very dark shades, nearing blackglass, of olive and amber are highly prized and quite scarce. There is a considerably scarce light aqua variant with two segmented threads, thought to have a connection to the National Insulator Co and Lawrence Gray. Most, if not all (excluding the segmented thread units), were likely manufactured by Brookfield.

PicturePoster #10701627

PicturePoster #142380120

Vertical bar: Mostly found with a straight skirt in shades of aqua and green. Most are relatively common. A tapered skirt variant can be found in green aqua.

PicturePoster #177547005 (straight & tapered skirt comparison)


These were specifically designed for use on a crossarm (and similar applications) with a duplex pin (having threads at both ends), to double up or add lines without adding additional crossarms. The duplex pin was installed through the crossarm, with a conventional insulator installed at the top thread and a CD 187 or 188 installed on the lower thread.

PicturePoster #76691301 (duplex pins)

Duplex sidepins were also made available for doubling up lines where sidepin applications were desirable. Some collectors have been known to refer to the Brown's ponies as "mine insulators", because they have also been found in mines. This was evidently a secondary use, not their original intended application as clearly stated in the patent design information.

The molding process required a slug or thimble of glass to be punched out after each insulator was manufactured. This is evident by the roughness usually found at one end of the threads.

PicturePoster #118983110 (slug & thimble still in place)

There is much more that can be shared on these two closely related and interesting CD's. These brief comments on the Insulator of the Week are not intended to be complete and are presented to encourage discussion and additional information from ICON. Now it's your turn to share info and/or post photos of your favorite CD 187 & 188 Brown's ponies!




Colin Jung commented on Wed, Apr 30 2008

Here is a detailed ICON discussion of these CD's that has been archived on the website, [[1]]. Bill Meier: Note that some of the internal weblinks won't work because they still have the dot-com vs. dot-info suffix.

The California Brown's Ponies have two different embossing heights, like the California crosstops, CD208. The California items also may have factory grinding to smooth out the jagged end where the slug plate was punched out.

Does anyone have a close-up photo of these Brown's Ponies in service?

Brent Burger commented on Wed, Apr 30 2008

No embossing: Light aqua. This listing contains a 5/8” pinhole and appears to be quite rare. (5/8” pinhole comparison)

I submit this pinhole is larger than 5/8" inches. At the time I owned this piece, I tried to mount it on a Surge pin (which measured a rough 5/8") and it was far too loose to engage. A tape measure across the insulator opening at the tighter end (tapered threads like almost all insulators) showed something closer to 3/4" pinhole, but without an exact pin, could not say absolutely for sure. It sure was NOT a standard 1" pin.

Claude Wambold commented on Tues, May 5 2008

Years ago, early 1970's to mid 1980's, I worked for a construction Co. and we did a lot of demo in Phila., PA. Sometimes we would take down a whole block of row houses. The majority of them had a rack up under the eaves where the electric service came in. Some of them held three CD188's. A lot of them had a CD188 top and bottom and a CD1110 unembossed in the middle. There were also some with the B.E.L. Co. embossed CD1110 in the middle. The scarest combination was the CD188 top and bottom and a CD185.2 B.E.L. Co. in the middle. I have one in light aqua. As for color in the CD188's, a lot were medium and dark aqua but there was enough color to make it interesting. There were various greens including Emerald and Olive Green and a few Olive Ambers. I had one that was 20% Aqua, 40% Green & 40% Amber. As for the CD187 Greeley, they were used in the Atlantic City, NJ area. A few years ago, I bought some from a bottle digger who was digging a dump outside of AC. He hit a section that was all insulators, AM Tel and Tel tolls, CD160 Brookfields and some Greeley's, also some one piece tramps.

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