Insulators Home > Insulator Styles > Glass > Non-Pintype > CD 1138
Manufacturer: Hemingray
Mnfr Code: 90
Date: 1900s - 1920s
Manufacturer: Brookfield
Mnfr Code: 416
Date: 1900s - 1920s
Colors: Aqua, Dark Aqua, Light Aqua, Ice Aqua, Milky Aqua, Off Clear, Emerald Green
Usage: Guy Wire Strain
The McDougalds' 2003 Glass Insulators Price Guide says the only known CD 1138s are unembossed. Average size is 2.25 to 3 inch length, 2.25 inch base diameter.
The Hemingray Database lists the CD 1138 as being a product of both Hemingray and Brookfield.
Gus Stafford posted a Hemingray catalog excerpt in the Insulators.info photo gallery. It says this size of insulator is their number 90. An excerpt from a 1907 Western Electric catalog at Insulators.info calls them "span wire insulators", and says this one weighs 11 ounces and its 'crushing strength' is 4912 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 416, with the telegraph code word "Gunda". Each one weighs about 12 ounces. The catalog calls them "circuit break insulators".
Brian Riecker's site includes photos of a CD 1138 in Aqua and another Aqua with its wires, as well as Ice Aqua, Ice Blue Aqua, Ice Green Aqua, and Clear. He also posted a photo in Insulators.info's photo gallery with the Clear CD 1138 next to an Aqua, and another photo with an Emerald Green CD 1138 next to an Aqua.
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). Rick Bentley posted an Aqua CD 1138 for sale. He later posted another Aqua CD 1138 (Aqua CD 1138 photo 2; Aqua CD 1138 photo 3).
Bill Ostrander's photo album includes a CD1140 with two sizes of CD 1138.
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."
Insulators Home > Insulator Styles > Glass > Non-Pintype > CD 1138
Contact: A.C. Walker
