Here is a book that taught Elton Gish everything he knows about porcelain insulators. jack Tod was the father of the porcelain insulator hobby. This book was so complete for its time. He covered his style chart, a complete pricing guide and a great deal of space devoted to the history of the porcelain manufacturers. With more collectors getting into porcelain insulators, this book will give a great foundation. The book is hard cover and in very good condition except the binding has let go in one spot. This is the 1971 edition and is autographed by Mr. Tod. Give away price of $5 plus shipping