Insulator Advertising History

Early trade journals and technical association proceedings provide some excellent historical information in the form of early advertisements.  These provide excellent information on insulator dating, specific uses, and even if an item actually is an insulator!  This data is organized by company and date.  The table below has links for each company's ads.  Please contact me if you have additional information.  I'll need the ad and the full information on where it was originally located as this is critical for research.

• Armstrong Cork Co.
• Corning Glass Co.
• Hemingray Glass Co.
• Lapp Insulator Co.
• Locke Insulator Co.
• The Ohio Brass Co.
• R. Thomas & Sons Co.
• Whitall Tatum Co.

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