How are CD numbers assigned to glass insulators?
Consolidated Design (CD) numbers are assigned to specific shapes of pintype glass insulators, regardless of the manufacturer, embossing or style number. Minor variations in size or detail do not affect the CD number assigned to an insulator.
What kind of CDs do Bill and Jill insulators sell?
This auction features a number of rare CDs such as CD 141.7 Twiggs, CD 158.9 Screw-top Boston, CD 119 O’Brien and CD 299.7 Lowex, as well as a number of American, Boston Bottle Works and Westinghouse insulators. There will also be many colorful CD 145’s, 151’s, and 162’s.
What are the numbers for glass insulators outside of North America?
Glass Insulators from Outside North America for CD 376 to 699 contains both black and white photographs and one quarter scale drawings and cross sections with dimensions of the insulators. How are CD numbers assigned? A separate article CD Assignment Guidelines provides details on this. [This section is under development]
What are the CD numbers for pintype insulators?
Insulators: A History and Guide to North American Pintype Insulators for CD 100 to 375 (threaded) and CD 700 to 799 (threadless) contains full size black and white photographs of the insulators.
This auction features a number of rare CDs such as CD 141.7 Twiggs, CD 158.9 Screw-top Boston, CD 119 O’Brien and CD 299.7 Lowex, as well as a number of American, Boston Bottle Works and Westinghouse insulators. There will also be many colorful CD 145’s, 151’s, and 162’s.
When did Louis Cauvet invent the threaded insulator?
Threaded insulators were first patented by Louis Cauvet in 1865 as a more secure means of fastening the glass objects to the tops of wooden pins. This design is still considered standard for electrical insulators today.
What are the colors of vintage glass insulators?
Vintage Glass Insulators. Commonly made from glass or porcelain in a dazzling array of shapes and colors, including amber, cobalt blue, olive green (one shade is known among insulator collectors as “Seven-Up”), and royal purple, antique insulators are prized for their rarity and physical beauty.
Who are the manufacturers of glass insulators in Canada?
One of the most prolific insulator manufacturers in Canada was Dominon Glass Co., whereas Hemingray Glass Co. owned much of the market for insulators in the United States. Incorporated in 1870, Hemingray operated factories in Kentucky and Indiana, where it also produced other glass items, like bottles, fruit jars, kerosene lamps, and glassware.
