Insulators Home > Insulator Styles > Glass > Non-Pintype > CD 1140
Manufacturer: Hemingray
Mnfr Code: 91
Date: 1900s - 1920s
Manufacturer: Brookfield
Mnfr Code: 74
Date: 1900s - 1920s
Colors: Aqua, Dark Aqua, Light Aqua, Light Blue, Green, Emerald Green
Usage: Guy Wire Strain
The McDougalds' 2003 Glass Insulators Price Guide says the only known CD 1140s are unembossed. Average size is 2.75 to 3.75 inch length, 2.75 inch base diameter. In earlier versions of the CD numbers, the CD 1140 was 3 inches long, and a separate CD 1142 was 3.75 inches long. (These versions of the listings - 1140NE010 and 1142NE010 - can still be seen in the Online Price Guide with 1999 info, as of March 2004.) Apparently, the CD 1142 has subsequently been combined into the CD 1140, due to having the same base diameter.
Gus Stafford posted a Hemingray catalog excerpt in the Insulators.info photo gallery. It says this size of insulator is their number 91. An excerpt from a 1907 Western Electric catalog at Insulators.info calls them "span wire insulators", and says this one weighs 17.5 ounces and its 'crushing strength' is 5910 pounds. They both show images with 'Hemingray' embossings, despite no embossed ones actually known today.
A Brookfield catalog excerpt from 1912, available at Peninsulators, says this size of insulator is their number 74, with the telegraph code word "Gater". Each one weighs about 16 ounces, and supports strains up to 5000 pounds. The catalog calls them "circuit break insulators".
Brian Riecker's site includes photos of a CD 1142 (now CD 1140) in Aqua, Light Aqua, and Light Blue.
Gus Stafford posted, in Insulators.info's photo gallery, CD drawings of the CD 1138 and CD 1140, based on Brian Reicker's collection. Gus also posted a photo of a CD 1138 next to a CD 1140, and Green and Aqua CD 1138s or CD 1140s. Brent Burger posted a photo of a CD 1138 on a CD 1140 next to a CD 1142 (now CD 1140). Craig Johnson posted a photo of a Dark Aqua CD 1140. Bill Kemp sold an Aqua CD 1140. Dave Elliot sold two Aqua CD 1140s (one with Amber Swirls?), a Dark Aqua and a Light Aqua CD 1140, a Dark Aqua CD 1140, two Aqua CD 1140s, and an Aqua CD 1140 with a Large Bubble.
Bill Ostrander's photo album includes a CD1140 with two sizes of CD 1138.
Nathan Lamkey's collection photos include a CD 1142 (now CD 1140) in Aqua.
Michael Jones posted a photo on Insulators.info's gallery of either CD 1138s or CD1140s used for power dead-ends. Mike Parker posted a photo of a CD 1138 or CD 1140 supporting a trolley wire at the Oregon Electric Railway Museum. Paul Greaves posted a photo of an Aqua CD 1138 or CD 1140, in use in the Bodie, California ghost town (closeup of Aqua CD 1138 or CD 1140).
The NIA's Glass Strain Insulators page says "Although all relatively uncommon, there are a variety of glass strain insulators available. These were typically used to insulate a telephone or power pole guy wire from ground." It also has photos of an Aqua CD 1138 or 1140.
Pyrex's Plain Facts About Insulators brochure, available at the Peninsulators site, says "Because of pressing limitations, some shapes -- guy strain insulators, for example -- are difficult to make at all."
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