Porcelain Insulator Comparison Appraisal

Clear Glass Electrical Insulator

This item is a clear glass electrical insulator, likely for power or telegraph lines. It exhibits a classic spool or multi-petticoat design, characterized by multiple concentric skirts or 'petticoats' decreasing in diameter from top to bottom. This design increases the leakage distance for surface current, improving its insulation properties. The glass appears to be clear, translucent, and somewhat cloudy or dirty, possibly from environmental exposure. There are visible signs of wear and dirt, including what appears to be a dark streak or residue on one of the inner surfaces of a petticoat, indicating its use and age. The construction is solid molded glass, typical of insulators from the late 19th to mid-20th century. There are no immediately discernible manufacturing marks or brands visible in the provided image, but such identification is often located on the top dome or inside the threading, which is not clearly visible. The overall condition suggests a used item, possibly with minor chips or scuffs not clearly visible but typical for such vintage pieces. The threading on the inner core, where it would have attached to a pin, is also not clearly visible but implied by its form. Its size appears substantial, suggesting its role in supporting significant electrical loads. The clear glass allows some light to pass through, highlighting its contours. The item sits on a perforated white shelf, and there's a blue sticker on its top surface with 'OD $4.00' and 'SZ L', indicating it may be for sale as an "Odd D" item, priced at $4.00, and sized as Large.