This picture was found in a 1906 book called "High-tension Power Transmission: a series of papers and discussions presented at the meetings of the American Institute of Electrical Engineers" As far as is known, this massive 1902 four part insulator design by V. G. Converse was never put into regular service on a line or in a substation and was strictly experimental in nature. Here is a link to the patent information on this insulator: http://reference.insulators.info/patents/detail/?patent=701847&type=U Here is a link to a photo of the only existing specimen... WOW!! http://www.insulators.info/photos/photos/3178laqu.htm