IOTW CD 188
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CD 188 - Insulator of the Week on Wed, 30 Apr 2008
Nickname
Brown's Pony; Deep Groove Brown's Pony; Duplex Insulator; Through Hole; "Mine Insulator"
Related Patents
Utility Patent 353120 issued to Robert G. Brown on November 23, 1886
Details
Embossings
B: Dark aqua and deep greens, including olive green. Clearly a Brookfield product.
No embossing: Aqua and green to yellow green.
Pat'd Nov. 23d 1886: Clear, shades of aqua and green, including emerald and olive green, some containing amber. Most, if not all, are likely of Brookfield origin.
Comments
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!
Questions
None
Discussion
Colin Jung commented on Wed, Apr 30 2008
Here is a detailed ICON discussion of these CD's that has been archived on the insulators.info website, [[1]].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?
