This is a photo from an eBay auction for an 1893 General Electric Catalog of Incandescent Lighting Apparatus and Supplies. I don't own the catalog. Illustrated are some of the line insulators sold by GE at the time. I can identify a CD 245 with oil cup, CD 134, CD 104, CD 162, CD 116, CD 259 and an unidentified wall tube. Look at those multiple ridges on one end.