Some e-books pops up on the net too. I found one picture in the e-book of the Telefon Hirmondo.

Telefon Hirmondo: http://en.wikipedia.org/wiki/Telefon_H%C3%ADrmond%C3%B3

Normal Insulators are in function of two Nosers and one T-bar.. These type of Insulators were not standard in the Hungarian telegraph and telephone network unfortunately. The power companies used them rare times, they are super rare in Hungary. This picture is older than the Napoleon Hat terminal Insulator's patent.