IOTW CD 139.9

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CD 139.9 - Insulator of the Week on Mon, 02 Jun 2008


USLD; the tapered dome variant is referred to as the "peaked dome USLD".

Related Patents

none known


Embossing: (f) McLaughlin (r) USLD

Colors: Aqua to green aqua.


The "peaked dome" mold variant is considerably scarcer and hold a collector value of three to four times higher than the more readily found rounded dome variant. I have heard of two separate groups of the rounded dome variants that were originally found in So Cal, but to my knowledge neither group contained a peaked dome. Anyone have any solid information on where the peaked dome variants were used?

(rounded dome) PicturePoster #190828370

(scroll to bottom for pic of the peaked dome variant) [1]

One known area of usage was in Southern California by a telephone company known as United States Long Distance (USLD), especially in the San Diego/Escondido area and toward the southern coast. Any other areas known?

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 a photo of your CD 139.9!




James Doty commented on Mon, 2 Jun 2008

USLD Phone Bill dated 1911

Andrew Gibson commented on Fri, 6 Jun 2008

The CD 139.9 was made by the McLaughlin Glass Company, which means they were made sometime between 1922 and 1935. These were supposedly a prototype insulator for USLD manufactured in only a small quantity. Does anyone know more precisely when these insulators where made? Also, in regards to the round vs. peak dome varieties, did these come from different molds, or was a mold or molds get re-worked from one to the other variety?

Denny Hackthorne commented on Fri, 6 Jun 2008

If you are going to Portland, I will have the two side by side in my display if you would like to take a peek. Mine are definitely two different molds. The Mclaughlin side is the same on both insulators. On the USLD side the S is very different on the two insulators.

Richard McLaughlin commented on Sat, 7 Jun 2008

I have had seven round dome USLD, gave some to family, currently have two round and one pointed, both mint. There are embossing differences on some of the round dome pieces. A few are sharp and angular, most are smooth. I've only seen the pointed with smooth embossing. The smooth are not the result of wear but are well defined. Not a whole lot of info on this CD.

Brent Burger commented on Sat, 7 Jun 2008

I recall people saying these pieces were found in locations similar to where fogbowl type insulators were used. This seems an obvious correlation if the reports are true. Why else would a telephone design involve such overkill as to resemble a high voltage power design ? It seems clear to this observer that the USLD design would cost FAR more than just buying readily available No.9 ponies from McLaughlin. What would justify the expense ? Certainly dust and fog conditions have proven just such a reason.

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