This is one of the Brookfield insulator pages from a 1914 Pettingell Andrews electrical supplies catalog. It depicts a cabletop double petticoat insulator design that I don't recognize among at least American CD's. Any one know the story on this one? It is the circled drawing.
I don't own the catalog, so I cannot provide a better, more detailed, image. Notice the extra wide pinhole compared to the other drawings of Brookfield power insulators.
Answer found in the North America Glass Insulator Report by Woody Woodward. It is an unreported design found in three different sizes and assigned the reserved CD numbers: CD 222, CD 223 and CD 224. Thanks Bill Snell