The No.38 was submitted to AT&T around 1910 as one of the designs for a new standard insulator (see article). Hemingray also produced the CD 169 Type I and the CD 152 No.40 for this experiment. The CD 152 won out, but this style must have also been successful enough to go into production. This is one of my favorite oddball styles that Hemingray produced. Collectors have nicknamed this style the "teepee".